diff --git a/src/Dev/State/FixtureTestState.php b/src/Dev/State/FixtureTestState.php
index ec5a32d32..80ac22e4f 100644
--- a/src/Dev/State/FixtureTestState.php
+++ b/src/Dev/State/FixtureTestState.php
@@ -166,7 +166,7 @@ class FixtureTestState implements TestState
             $this->loadFixture($fixtureFile, $test);
         }
         // Flag as loaded
-        $this->loaded[get_class($test)] = true;
+        $this->loaded[strtolower(get_class($test))] = true;
     }
 
     /**
@@ -265,7 +265,8 @@ class FixtureTestState implements TestState
      */
     protected function resetFixtureFactory($class)
     {
-        $this->fixtureFactories[strtolower($class)] = Injector::inst()->create(FixtureFactory::class);
+        $class = strtolower($class);
+        $this->fixtureFactories[$class] = Injector::inst()->create(FixtureFactory::class);
         $this->loaded[$class] = false;
     }
 
@@ -277,6 +278,6 @@ class FixtureTestState implements TestState
      */
     protected function getIsLoaded($class)
     {
-        return !empty($this->loaded[$class]);
+        return !empty($this->loaded[strtolower($class)]);
     }
 }
diff --git a/src/ORM/Connect/Database.php b/src/ORM/Connect/Database.php
index 4c60ed085..670b07b5b 100644
--- a/src/ORM/Connect/Database.php
+++ b/src/ORM/Connect/Database.php
@@ -676,7 +676,7 @@ abstract class Database
     public function transactionDepth()
     {
         // Placeholder error for transactional DBs that don't expose depth
-        if ($this->supportsTransactions()) {
+        if (!$this->supportsTransactions()) {
             user_error(get_class($this) . " does not support transactionDepth", E_USER_WARNING);
         }
         return 0;
diff --git a/src/ORM/Connect/MySQLDatabase.php b/src/ORM/Connect/MySQLDatabase.php
index 49f6dd62d..0477591de 100644
--- a/src/ORM/Connect/MySQLDatabase.php
+++ b/src/ORM/Connect/MySQLDatabase.php
@@ -360,10 +360,7 @@ class MySQLDatabase extends Database
             return false;
         }
         --$this->transactionNesting;
-        if ($this->transactionNesting <= 0) {
-            $this->transactionNesting = 0;
-            $this->query('COMMIT AND ' . ($chain ? '' : 'NO ') . 'CHAIN');
-        }
+        $this->query('COMMIT AND ' . ($chain ? '' : 'NO ') . 'CHAIN');
         return true;
     }