diff --git a/docs/en/04_Changelogs/4.3.4.md b/docs/en/04_Changelogs/4.3.4.md
new file mode 100644
index 000000000..d2755b10b
--- /dev/null
+++ b/docs/en/04_Changelogs/4.3.4.md
@@ -0,0 +1,38 @@
+# 4.3.4
+
+<!--- Changes below this line will be automatically regenerated -->
+
+## Change Log
+
+### Features and Enhancements
+
+ * 2019-05-30 [c569cec4](https://github.com/silverstripe/silverstripe-cms/commit/c569cec4ea49612ddc9d430d7fe792971c93c586) Add updateHintsCacheKey extension point to fix invalid caching (Garion Herman)
+ * 2019-03-05 [39a29fa2f](https://github.com/silverstripe/silverstripe-framework/commit/39a29fa2f65ebd9a3ad486c6d85249322bcb9a64) has_extension() should allow injector overrides (Aaron Carlino)
+
+### Bugfixes
+
+ * 2019-05-24 [25aa3af03](https://github.com/silverstripe/silverstripe-framework/commit/25aa3af032f24314ac458743db78028e1aa66ead) HeaderField requires the optional Title field (Dylan Wagstaff)
+ * 2019-05-14 [3f1479edb](https://github.com/silverstripe/silverstripe-framework/commit/3f1479edbbe406a6b9ca1c5284f2daabf455c8b5) DataQuery overwriting _SortColumn selects (#8974) (Aaron Carlino)
+ * 2019-05-13 [3a5c14f7c](https://github.com/silverstripe/silverstripe-framework/commit/3a5c14f7c288ce160012651869cb2458eee18b6b) password validation min length message (#8976) (Guy Marriott)
+ * 2019-05-13 [db0e6f710](https://github.com/silverstripe/silverstripe-framework/commit/db0e6f7104d6250d0afe3d717b70497ee6fade2d) Fix password validation min length message (matt-in-a-hat)
+ * 2019-05-10 [94f3054](https://github.com/silverstripe/silverstripe-admin/commit/94f3054e18f83680864f283f979ac8df4353688a) Add offending class to exception message (Guy Marriott)
+ * 2019-04-18 [e6c1061](https://github.com/silverstripe/silverstripe-asset-admin/commit/e6c1061600941ffa26ec42fc4fc7032d894e944d) folders always go first when ordering (#936) (Serge Latyntsev)
+ * 2019-04-17 [e0eaf61](https://github.com/silverstripe/silverstripe-versioned-admin/commit/e0eaf61af4bc9f4fa682c2af143f9f4665464442) Use Firefox compliant polyfill for ResizeAware (Robbie Averill)
+ * 2019-04-17 [e59ca40](https://github.com/silverstripe/silverstripe-campaign-admin/commit/e59ca40d1357be4ba6c1193de690573815d78c6c) Use Firefox compliant polyfill for ResizeAware (Robbie Averill)
+ * 2019-04-16 [9d6b5048a](https://github.com/silverstripe/silverstripe-framework/commit/9d6b5048a620f793a2910b858331a5141d161e63) Table aliases are retained on base tables in queries built using SQLConditionalExpression (#8918) (Guy Marriott)
+ * 2019-04-15 [63360f804](https://github.com/silverstripe/silverstripe-framework/commit/63360f80482d860495900a39282b54680f38cd45) Replace substr with mb_substr to get the correct position (Sheila Bañez)
+ * 2019-04-15 [4fbe0fd6](https://github.com/silverstripe/silverstripe-cms/commit/4fbe0fd6b9018d2ff16f5edc022daa92702e91a5) Fix linking anchor on the same page (#2388) (Will Rossiter)
+ * 2019-04-14 [a48beac84](https://github.com/silverstripe/silverstripe-framework/commit/a48beac84544ed2db89ac094cc80508742284c1c) Calculate threshold condition with SQL rather than PHP (Guy Marriott)
+ * 2019-04-09 [661a27e](https://github.com/silverstripe/silverstripe-assets/commit/661a27e93efcf98c2521b42ec802ecf625e0a6ea) Fix hash redirection logic on PostreSQL and add PostreSQL to the travis matrix (#237) (Serge Latyntsev)
+ * 2019-04-05 [594af7713](https://github.com/silverstripe/silverstripe-framework/commit/594af7713487da0fc200d6df8d9c706c26e3c767) prevent unnecessary field alterations for enums with empty defaults (Loz Calver)
+ * 2019-04-04 [759968bbe](https://github.com/silverstripe/silverstripe-framework/commit/759968bbe2f8e3a4087b2f08622abc4cc70f2867) Fix Undefined variable: result when catch Exception (Ian Patel)
+ * 2019-04-04 [a3c61e5](https://github.com/silverstripe/silverstripe-admin/commit/a3c61e546f77e78fdefd3e678b0dbe0ca52e933b) Long site names now display correctly in CMS menu with equal margins and alignment (Robbie Averill)
+ * 2019-03-26 [83ec0b69f](https://github.com/silverstripe/silverstripe-framework/commit/83ec0b69fa642ed1ad734fff10ea6dc3aeba6cf3) Resolve issue where schema changes between enum / non-enum types (Damian Mooyman)
+ * 2019-03-25 [fae19c16b](https://github.com/silverstripe/silverstripe-framework/commit/fae19c16b54f077bbd7665a50df516d290faa07e) has_one File form scaffolding (Jonathon Menz)
+ * 2019-03-22 [95344a6](https://github.com/silverstripe/silverstripe-asset-admin/commit/95344a6e291dc40c361ebbcb787eb9656b5aa905) Re-instate assuming redux knows best with more specific checks (See #922) (Guy Marriott)
+ * 2019-03-22 [cb670f4](https://github.com/silverstripe/silverstripe-admin/commit/cb670f4604dab8328b939ebe583f09928ecbe32d) TinyMCE editor.scss now applies to the correct body class, and has correct broken link colours (Robbie Averill)
+ * 2019-03-21 [595d8ec](https://github.com/silverstripe/silverstripe-asset-admin/commit/595d8ec8bc11e102ab6ef3ec1cbb99e9d5c09cab) UploadField now ensures that file data is copied to redux store of value updates (Guy Marriott)
+ * 2019-03-20 [388baa01b](https://github.com/silverstripe/silverstripe-framework/commit/388baa01b49fb47b7187c03bfdaa87b6712f5cdd) Fix linting (Aaron Carlino)
+ * 2019-03-19 [aa491d929](https://github.com/silverstripe/silverstripe-framework/commit/aa491d92940282a62748bbfe4f69a1e56b0ce2d8) Fix tests (Aaron Carlino)
+ * 2019-02-01 [3900b82](https://github.com/silverstripe/silverstripe-admin/commit/3900b82e2af96c96f20778fb7b9d7c51e84f6218) Scrolling out of auto-selected edit mode not switches back to split mode (Robbie Averill)
+ * 2019-01-18 [a4ec816](https://github.com/silverstripe/silverstripe-assets/commit/a4ec816839449605e579b36691e56a46354e9895) Add missing file upload error types (fixes #205) (Loz Calver)
diff --git a/src/Control/Email/Email.php b/src/Control/Email/Email.php
index 8d79db709..c343fade4 100644
--- a/src/Control/Email/Email.php
+++ b/src/Control/Email/Email.php
@@ -792,10 +792,10 @@ class Email extends ViewableData
 
         // Do not interfere with emails styles
         Requirements::clear();
-        
+
         // Render plain part
         if ($plainTemplate && !$plainPart) {
-            $plainPart = $this->renderWith($plainTemplate, $this->getData());
+            $plainPart = $this->renderWith($plainTemplate, $this->getData())->Plain();
         }
 
         // Render HTML part, either if sending html email, or a plain part is lacking
@@ -809,7 +809,7 @@ class Email extends ViewableData
             $htmlPartObject = DBField::create_field('HTMLFragment', $htmlPart);
             $plainPart = $htmlPartObject->Plain();
         }
-        
+
         // Rendering is finished
         Requirements::restore();
 
diff --git a/src/Control/Middleware/ConfirmationMiddleware.php b/src/Control/Middleware/ConfirmationMiddleware.php
index f4f903d6a..79acbfe21 100644
--- a/src/Control/Middleware/ConfirmationMiddleware.php
+++ b/src/Control/Middleware/ConfirmationMiddleware.php
@@ -33,6 +33,7 @@ class ConfirmationMiddleware implements HTTPMiddleware
 
     /**
      * Confirmation form URL
+     * WARNING: excluding SS_BASE_URL
      *
      * @var string
      */
@@ -81,8 +82,15 @@ class ConfirmationMiddleware implements HTTPMiddleware
      */
     protected function getConfirmationUrl(HTTPRequest $request, $confirmationStorageId)
     {
+        $url = $this->confirmationFormUrl;
+
+        if (substr($url, 0, 1) === '/') {
+            // add BASE_URL explicitly if not absolute
+            $url = Controller::join_links(Director::baseURL(), $url);
+        }
+
         return Controller::join_links(
-            $this->confirmationFormUrl,
+            $url,
             urlencode($confirmationStorageId)
         );
     }
diff --git a/src/Control/Middleware/URLSpecialsMiddleware.php b/src/Control/Middleware/URLSpecialsMiddleware.php
index 073e52e76..b2fb10a6d 100644
--- a/src/Control/Middleware/URLSpecialsMiddleware.php
+++ b/src/Control/Middleware/URLSpecialsMiddleware.php
@@ -2,6 +2,8 @@
 
 namespace SilverStripe\Control\Middleware;
 
+use SilverStripe\Control\Controller;
+use SilverStripe\Control\Director;
 use SilverStripe\Control\Middleware\URLSpecialsMiddleware\FlushScheduler;
 use SilverStripe\Control\Middleware\URLSpecialsMiddleware\SessionEnvTypeSwitcher;
 use SilverStripe\Control\HTTPRequest;
@@ -63,7 +65,12 @@ class URLSpecialsMiddleware extends PermissionAwareConfirmationMiddleware
             $request['urlspecialstoken'] = bin2hex(random_bytes(4));
 
             $result = new HTTPResponse();
-            $result->redirect('/' . $request->getURL(true));
+            $result->redirect(
+                Controller::join_links(
+                    Director::baseURL(),
+                    $request->getURL(true)
+                )
+            );
             return $result;
         }
     }
diff --git a/src/ORM/Connect/MySQLQuery.php b/src/ORM/Connect/MySQLQuery.php
index 22f11a3eb..f1dbfefd2 100644
--- a/src/ORM/Connect/MySQLQuery.php
+++ b/src/ORM/Connect/MySQLQuery.php
@@ -48,8 +48,11 @@ class MySQLQuery extends Query
     public function seek($row)
     {
         if (is_object($this->handle)) {
+            // Fix for https://github.com/silverstripe/silverstripe-framework/issues/9097 without breaking the seek() API
             $this->handle->data_seek($row);
-            return $this->nextRecord();
+            $result = $this->nextRecord();
+            $this->handle->data_seek($row);
+            return $result;
         }
         return null;
     }
diff --git a/src/ORM/Connect/MySQLStatement.php b/src/ORM/Connect/MySQLStatement.php
index 9c7fdce26..ca2cdbd32 100644
--- a/src/ORM/Connect/MySQLStatement.php
+++ b/src/ORM/Connect/MySQLStatement.php
@@ -105,8 +105,12 @@ class MySQLStatement extends Query
     public function seek($row)
     {
         $this->rowNum = $row - 1;
+
+        // Fix for https://github.com/silverstripe/silverstripe-framework/issues/9097 without breaking the seek() API
         $this->statement->data_seek($row);
-        return $this->next();
+        $result = $this->next();
+        $this->statement->data_seek($row);
+        return $result;
     }
 
     public function numRecords()
@@ -132,9 +136,4 @@ class MySQLStatement extends Query
         }
         return $row;
     }
-
-    public function rewind()
-    {
-        return $this->seek(0);
-    }
 }
diff --git a/src/ORM/Connect/Query.php b/src/ORM/Connect/Query.php
index 1f994dd7f..b1c3d4247 100644
--- a/src/ORM/Connect/Query.php
+++ b/src/ORM/Connect/Query.php
@@ -168,16 +168,15 @@ abstract class Query implements Iterator
      * Iterator function implementation. Rewind the iterator to the first item and return it.
      * Makes use of {@link seek()} and {@link numRecords()}, takes care of the plumbing.
      *
-     * @return array
+     * @return void
      */
     public function rewind()
     {
         if ($this->queryHasBegun && $this->numRecords() > 0) {
             $this->queryHasBegun = false;
             $this->currentRecord = null;
-            return $this->seek(0);
+            $this->seek(0);
         }
-        return null;
     }
 
     /**
diff --git a/src/ORM/DataObject.php b/src/ORM/DataObject.php
index ab41e0388..22c1ed53a 100644
--- a/src/ORM/DataObject.php
+++ b/src/ORM/DataObject.php
@@ -2318,6 +2318,8 @@ class DataObject extends ViewableData implements DataObjectInterface, i18nEntity
         $fs->fieldClasses = $params['fieldClasses'];
         $fs->ajaxSafe = $params['ajaxSafe'];
 
+        $this->extend('updateFormScaffolder', $fs, $this);
+
         return $fs->getFieldList();
     }
 
diff --git a/src/ORM/FieldType/DBString.php b/src/ORM/FieldType/DBString.php
index d40481dd7..5c40ac337 100644
--- a/src/ORM/FieldType/DBString.php
+++ b/src/ORM/FieldType/DBString.php
@@ -77,7 +77,7 @@ abstract class DBString extends DBField
      */
     public function getNullifyEmpty()
     {
-        return $this->options['nullifyEmpty'];
+        return !empty($this->options['nullifyEmpty']);
     }
 
     /**
@@ -99,7 +99,7 @@ abstract class DBString extends DBField
         }
 
         // Return "empty" value
-        if ($this->options['nullifyEmpty'] || $value === null) {
+        if ($this->getNullifyEmpty() || $value === null) {
             return null;
         }
         return '';
diff --git a/src/Security/Confirmation/Storage.php b/src/Security/Confirmation/Storage.php
index e27931590..0794e3646 100644
--- a/src/Security/Confirmation/Storage.php
+++ b/src/Security/Confirmation/Storage.php
@@ -2,7 +2,9 @@
 
 namespace SilverStripe\Security\Confirmation;
 
+use SilverStripe\Control\Controller;
 use SilverStripe\Control\Cookie;
+use SilverStripe\Control\Director;
 use SilverStripe\Control\HTTPRequest;
 use SilverStripe\Control\Session;
 use SilverStripe\Security\SecurityToken;
@@ -236,7 +238,8 @@ class Storage
      */
     public function setSuccessRequest(HTTPRequest $request)
     {
-        $this->setSuccessUrl($request->getURL(true));
+        $url = Controller::join_links(Director::baseURL(), $request->getURL(true));
+        $this->setSuccessUrl($url);
 
         $httpMethod = $request->httpMethod();
         $this->session->set($this->getNamespace('httpMethod'), $httpMethod);
diff --git a/tests/php/Control/Middleware/ConfirmationMiddlewareTest.php b/tests/php/Control/Middleware/ConfirmationMiddlewareTest.php
index cec934bc6..9b2f43f51 100644
--- a/tests/php/Control/Middleware/ConfirmationMiddlewareTest.php
+++ b/tests/php/Control/Middleware/ConfirmationMiddlewareTest.php
@@ -2,6 +2,7 @@
 
 namespace SilverStripe\Control\Tests\Middleware;
 
+use SilverStripe\Control\Director;
 use SilverStripe\Control\HTTPResponse;
 use SilverStripe\Control\Middleware\ConfirmationMiddleware;
 use SilverStripe\Control\Middleware\ConfirmationMiddleware\Url;
@@ -67,7 +68,7 @@ class ConfirmationMiddlewareTest extends SapphireTest
         $this->assertFalse($next);
         $this->assertInstanceOf(HTTPResponse::class, $response);
         $this->assertEquals(302, $response->getStatusCode());
-        $this->assertEquals('/dev/confirm/middleware', $response->getHeader('location'));
+        $this->assertEquals(Director::baseURL().'dev/confirm/middleware', $response->getHeader('location'));
 
         // Test bypasses have more priority than rules
         $middleware->setBypasses([new Url('dev/build')]);
diff --git a/tests/php/Core/MemoryLimitTest.php b/tests/php/Core/MemoryLimitTest.php
index 37dccd8d3..842e77645 100644
--- a/tests/php/Core/MemoryLimitTest.php
+++ b/tests/php/Core/MemoryLimitTest.php
@@ -66,6 +66,7 @@ class MemoryLimitTest extends SapphireTest
 
         // No argument means unlimited (but only if originally allowed)
         if (is_numeric($this->origMemLimitMax) && $this->origMemLimitMax < 0) {
+            Environment::setMemoryLimitMax(-1);
             Environment::increaseMemoryLimitTo();
             $this->assertEquals(-1, ini_get('memory_limit'));
         }
diff --git a/tests/php/ORM/DatabaseTest.php b/tests/php/ORM/DatabaseTest.php
index babcdb402..607515613 100644
--- a/tests/php/ORM/DatabaseTest.php
+++ b/tests/php/ORM/DatabaseTest.php
@@ -272,4 +272,25 @@ class DatabaseTest extends SapphireTest
         $result = DB::query('SELECT TRUE')->first();
         $this->assertInternalType('int', reset($result));
     }
+
+    /**
+     * Test that repeated iteration of a query returns all records.
+     * See https://github.com/silverstripe/silverstripe-framework/issues/9097
+     */
+    public function testRepeatedIteration()
+    {
+        $inputData = ['one', 'two', 'three', 'four'];
+
+        foreach ($inputData as $i => $text) {
+            $x = new MyObject();
+            $x->MyField = $text;
+            $x->MyInt = $i;
+            $x->write();
+        }
+
+        $query = DB::query('SELECT "MyInt", "MyField" FROM "DatabaseTest_MyObject" ORDER BY "MyInt"');
+
+        $this->assertEquals($inputData, $query->map());
+        $this->assertEquals($inputData, $query->map());
+    }
 }
diff --git a/tests/php/Security/Confirmation/StorageTest.php b/tests/php/Security/Confirmation/StorageTest.php
index 4c36f71a9..a3075769d 100644
--- a/tests/php/Security/Confirmation/StorageTest.php
+++ b/tests/php/Security/Confirmation/StorageTest.php
@@ -69,7 +69,7 @@ class StorageTest extends SapphireTest
 
         // ensure the data is persisted within the session
         $storage = new Storage($session, 'test', false);
-        $this->assertEquals('dev/build?flush=all', $storage->getSuccessUrl());
+        $this->assertEquals('/dev/build?flush=all', $storage->getSuccessUrl());
         $this->assertEquals('GET', $storage->getHttpMethod());
     }