Index: trunk/admin/install.php
===================================================================
diff -u -N -r3379 -r3812
--- trunk/admin/install.php	(.../install.php)	(revision 3379)
+++ trunk/admin/install.php	(.../install.php)	(revision 3812)
@@ -688,7 +688,8 @@
 	$application =& kApplication::Instance();
 	$application->Init();
 
-
+	$objThemes->CreateMissingThemes(false);
+	
 	$css_hash = $application->DB->GetCol('SELECT LOWER(Name) AS Name, StylesheetId FROM '.TABLE_PREFIX.'Stylesheets', 'StylesheetId');
 
 	$application->setUnitOption('css', 'AutoLoad', false);
Index: trunk/core/units/general/cat_dbitem_export.php
===================================================================
diff -u -N -r3797 -r3812
--- trunk/core/units/general/cat_dbitem_export.php	(.../cat_dbitem_export.php)	(revision 3797)
+++ trunk/core/units/general/cat_dbitem_export.php	(.../cat_dbitem_export.php)	(revision 3812)
@@ -1,7 +1,7 @@
 <?php
 
 	define('EXPORT_STEP', 200); // export by 200 items (e.g. links)
-	define('IMPORT_CHUNK', 50120); // 5 KB
+	define('IMPORT_CHUNK', 10240); //30720); //50120); // 5 KB
 
 	define('IMPORT_TEMP', 1);
 	define('IMPORT_LIVE', 2);
@@ -650,10 +650,12 @@
 
 			// create/update categories
 			$backup_category_id = $this->Application->GetVar('m_cat_id');
-
-			foreach ($this->curItem->CategoryPath as $category_name) {
+			
+			foreach ($this->curItem->CategoryPath as $category_index => $category_name) {
 				if (!$category_name) continue;
-				$category_id = $this->getFromCache('category_names', $category_name);
+				$category_key = crc32( implode(':', array_slice($this->curItem->CategoryPath, 0, $category_index + 1) ) );
+				
+				$category_id = $this->getFromCache('category_names', $category_key);
 				if ($category_id === false) {
 					// get parent category path to search only in it
 					$current_category_id = $this->Application->GetVar('m_cat_id');
@@ -674,11 +676,11 @@
 						if ($this->dummyCategory->Create()) {
 							$category_id = $this->dummyCategory->GetID();
 							$this->addToCache('category_parent_path', $category_id, $this->dummyCategory->GetDBField('ParentPath'));
-							$this->addToCache('category_names', $category_name, $category_id);
+							$this->addToCache('category_names', $category_key, $category_id);
 						}
 					}
 					else {
-						$this->addToCache('category_names', $category_name, $category_id);
+						$this->addToCache('category_names', $category_key, $category_id);
 					}
 				}
 
@@ -689,7 +691,7 @@
 			if (!$this->curItem->CategoryPath) {
 				$category_id = $backup_category_id;
 			}
-
+			
 			// create main record
 			if ($save_method == 'Create') {
 				$this->fillRequiredFields($this->false, $this->curItem, true);
@@ -716,7 +718,7 @@
 			$this->Application->SetVar('m_cat_id', $backup_category_id);
 			return true;
 		}
-
+		
 		/**
 		 * Returns category parent path, if possible, then from cache
 		 *
Index: trunk/kernel/units/general/cat_dbitem_export.php
===================================================================
diff -u -N -r3797 -r3812
--- trunk/kernel/units/general/cat_dbitem_export.php	(.../cat_dbitem_export.php)	(revision 3797)
+++ trunk/kernel/units/general/cat_dbitem_export.php	(.../cat_dbitem_export.php)	(revision 3812)
@@ -1,7 +1,7 @@
 <?php
 
 	define('EXPORT_STEP', 200); // export by 200 items (e.g. links)
-	define('IMPORT_CHUNK', 50120); // 5 KB
+	define('IMPORT_CHUNK', 10240); //30720); //50120); // 5 KB
 
 	define('IMPORT_TEMP', 1);
 	define('IMPORT_LIVE', 2);
@@ -650,10 +650,12 @@
 
 			// create/update categories
 			$backup_category_id = $this->Application->GetVar('m_cat_id');
-
-			foreach ($this->curItem->CategoryPath as $category_name) {
+			
+			foreach ($this->curItem->CategoryPath as $category_index => $category_name) {
 				if (!$category_name) continue;
-				$category_id = $this->getFromCache('category_names', $category_name);
+				$category_key = crc32( implode(':', array_slice($this->curItem->CategoryPath, 0, $category_index + 1) ) );
+				
+				$category_id = $this->getFromCache('category_names', $category_key);
 				if ($category_id === false) {
 					// get parent category path to search only in it
 					$current_category_id = $this->Application->GetVar('m_cat_id');
@@ -674,11 +676,11 @@
 						if ($this->dummyCategory->Create()) {
 							$category_id = $this->dummyCategory->GetID();
 							$this->addToCache('category_parent_path', $category_id, $this->dummyCategory->GetDBField('ParentPath'));
-							$this->addToCache('category_names', $category_name, $category_id);
+							$this->addToCache('category_names', $category_key, $category_id);
 						}
 					}
 					else {
-						$this->addToCache('category_names', $category_name, $category_id);
+						$this->addToCache('category_names', $category_key, $category_id);
 					}
 				}
 
@@ -689,7 +691,7 @@
 			if (!$this->curItem->CategoryPath) {
 				$category_id = $backup_category_id;
 			}
-
+			
 			// create main record
 			if ($save_method == 'Create') {
 				$this->fillRequiredFields($this->false, $this->curItem, true);
@@ -716,7 +718,7 @@
 			$this->Application->SetVar('m_cat_id', $backup_category_id);
 			return true;
 		}
-
+		
 		/**
 		 * Returns category parent path, if possible, then from cache
 		 *