diff --git a/core/model/DataObject.php b/core/model/DataObject.php
index 5ba1a7ee7..2f47dfdee 100644
--- a/core/model/DataObject.php
+++ b/core/model/DataObject.php
@@ -179,6 +179,9 @@ class DataObject extends ViewableData implements DataObjectInterface,i18nEntityP
 		$this->extension_instances = null;
 		$this->components = null;
 		$this->destroyed = true;
+		$this->record = null;
+		$this->orignal = null;
+		$this->changed = null;
 		$this->flushCache();
 	}
 
@@ -713,7 +716,7 @@ class DataObject extends ViewableData implements DataObjectInterface,i18nEntityP
 				return false;
 			}
 		}
-		
+
 		$this->onBeforeWrite();
 		if($this->brokenOnWrite) {
 			user_error("$this->class has a broken onBeforeWrite() function.  Make sure that you call parent::onBeforeWrite().", E_USER_ERROR);
diff --git a/dev/CsvBulkLoader.php b/dev/CsvBulkLoader.php
index b2f38bb77..c0d59ed53 100644
--- a/dev/CsvBulkLoader.php
+++ b/dev/CsvBulkLoader.php
@@ -86,6 +86,7 @@ class CsvBulkLoader extends BulkLoader {
 				$obj->setComponent($relationName, $relationObj);
 				$obj->{"{$relationName}ID"} = $relationObj->ID;
 				$obj->write();
+				$obj->flushCache(); // avoid relation caching confusion
 				
 			} elseif(strpos($fieldName, '.') !== false) {
 				// we have a relation column with dot notation
@@ -95,11 +96,10 @@ class CsvBulkLoader extends BulkLoader {
 				$relationObj->write();
 				$obj->{"{$relationName}ID"} = $relationObj->ID;
 				$obj->write();
+				$obj->flushCache(); // avoid relation caching confusion
 			}
 			
-			$obj->flushCache(); // avoid relation caching confusion
 		}
-		$id = ($preview) ? 0 : $obj->write();
 
 		// second run: save data
 		foreach($record as $fieldName => $val) {
@@ -127,9 +127,15 @@ class CsvBulkLoader extends BulkLoader {
 			$results->addCreated($obj, $message);
 		}
 		
+		$objID = $obj->ID;
+		
+		$obj->destroy();
+		
 		// memory usage
 		unset($existingObj);
 		unset($obj);
+		
+		return $objID;
 	}
 	
 	/**
diff --git a/security/Member.php b/security/Member.php
index 2807a13bf..51fe36a0f 100644
--- a/security/Member.php
+++ b/security/Member.php
@@ -452,7 +452,6 @@ class Member extends DataObject {
 	 */
 	function onBeforeWrite() {
 		if($this->SetPassword) $this->Password = $this->SetPassword;
-
 		$identifierField = self::$unique_identifier_field;
 		if($this->$identifierField) {
 			$idClause = ($this->ID) ? " AND `Member`.ID <> $this->ID" : '';
@@ -470,6 +469,7 @@ class Member extends DataObject {
 				foreach($existingRecord->getAllFields() as $k => $v) {
 					if(!isset($this->changed[$k]) || !$this->changed[$k]) $this->record[$k] = $v;
 				}
+				$existingRecord->destroy();
 			}
 		}