Index: trunk/core/units/general/cat_dbitem_export.php
===================================================================
diff -u -r3543 -r3616
--- trunk/core/units/general/cat_dbitem_export.php	(.../cat_dbitem_export.php)	(revision 3543)
+++ trunk/core/units/general/cat_dbitem_export.php	(.../cat_dbitem_export.php)	(revision 3616)
@@ -509,7 +509,7 @@
 			
 			// create/update categories
 			$backup_category_id = $this->Application->GetVar('m_cat_id');
-
+			
 			foreach ($this->curItem->CategoryPath as $category_name) {
 				if (!$category_name) continue;
 				$category_id = $this->getFromCache('category_names', $category_name);
@@ -545,6 +545,9 @@
 					$this->Application->SetVar('m_cat_id', $category_id);
 				}
 			}
+			if (!$this->curItem->CategoryPath) {
+				$category_id = $backup_category_id;
+			}
 			
 			// create main record
 			$save_method = 'Create';
@@ -751,7 +754,7 @@
 				$category_path = $this->Conn->GetOne($sql);
 				$category_path = explode('>', $category_path);
 				
-				if ($this->exportOptions['IsBaseCategory'] ) {
+				if ($this->exportOptions['IsBaseCategory']) {
 					$i = $this->exportOptions['BaseLevel'];
 					while ($i > 0) {
 						array_shift($category_path);
Index: trunk/kernel/units/general/cat_event_handler.php
===================================================================
diff -u -r3591 -r3616
--- trunk/kernel/units/general/cat_event_handler.php	(.../cat_event_handler.php)	(revision 3591)
+++ trunk/kernel/units/general/cat_event_handler.php	(.../cat_event_handler.php)	(revision 3616)
@@ -1260,7 +1260,7 @@
 
 			if ($folder_handle = opendir(EXPORT_PATH)) {
 				while (false !== ($file = readdir($folder_handle))) {
-					if ( substr($file, 0, 1) == '.' || strtolower($file) == 'cvs' || strtolower($file) == 'dummy' || filesize(EXPORT_PATH.'/'.$file) == 0) continue;
+					if (is_dir(EXPORT_PATH.'/'.$file) || substr($file, 0, 1) == '.' || strtolower($file) == 'cvs' || strtolower($file) == 'dummy' || filesize(EXPORT_PATH.'/'.$file) == 0) continue;
 
 					$file_size = formatSize( filesize(EXPORT_PATH.'/'.$file) );
 					$import_filenames[$file] = $file.' ('.$file_size.')';
Index: trunk/core/units/general/cat_event_handler.php
===================================================================
diff -u -r3591 -r3616
--- trunk/core/units/general/cat_event_handler.php	(.../cat_event_handler.php)	(revision 3591)
+++ trunk/core/units/general/cat_event_handler.php	(.../cat_event_handler.php)	(revision 3616)
@@ -1260,7 +1260,7 @@
 
 			if ($folder_handle = opendir(EXPORT_PATH)) {
 				while (false !== ($file = readdir($folder_handle))) {
-					if ( substr($file, 0, 1) == '.' || strtolower($file) == 'cvs' || strtolower($file) == 'dummy' || filesize(EXPORT_PATH.'/'.$file) == 0) continue;
+					if (is_dir(EXPORT_PATH.'/'.$file) || substr($file, 0, 1) == '.' || strtolower($file) == 'cvs' || strtolower($file) == 'dummy' || filesize(EXPORT_PATH.'/'.$file) == 0) continue;
 
 					$file_size = formatSize( filesize(EXPORT_PATH.'/'.$file) );
 					$import_filenames[$file] = $file.' ('.$file_size.')';
Index: trunk/core/units/general/cat_dbitem.php
===================================================================
diff -u -r3568 -r3616
--- trunk/core/units/general/cat_dbitem.php	(.../cat_dbitem.php)	(revision 3568)
+++ trunk/core/units/general/cat_dbitem.php	(.../cat_dbitem.php)	(revision 3616)
@@ -305,14 +305,14 @@
 		$error_field = isset($params['error_field']) ? $params['error_field'] : $field;
 		if ( getArrayValue($params,'required') )
 		{
-			if (getArrayValue($params, 'formatter') == 'kUploadFormatter')
+			/*if (getArrayValue($params, 'formatter') == 'kUploadFormatter')
 			{
 				$value = $this->GetDBField($field);
 				$res = is_array($value) && $value['size'] ? true : false;
 			}
-			else {
+			else {*/
 				$res = ( (string) $this->FieldValues[$field] != '');
-			}
+//			}
 		}
 		if (!$res) $this->FieldErrors[$error_field]['pseudo'] = 'required';
 		return $res;
Index: trunk/kernel/units/general/cat_dbitem.php
===================================================================
diff -u -r3568 -r3616
--- trunk/kernel/units/general/cat_dbitem.php	(.../cat_dbitem.php)	(revision 3568)
+++ trunk/kernel/units/general/cat_dbitem.php	(.../cat_dbitem.php)	(revision 3616)
@@ -305,14 +305,14 @@
 		$error_field = isset($params['error_field']) ? $params['error_field'] : $field;
 		if ( getArrayValue($params,'required') )
 		{
-			if (getArrayValue($params, 'formatter') == 'kUploadFormatter')
+			/*if (getArrayValue($params, 'formatter') == 'kUploadFormatter')
 			{
 				$value = $this->GetDBField($field);
 				$res = is_array($value) && $value['size'] ? true : false;
 			}
-			else {
+			else {*/
 				$res = ( (string) $this->FieldValues[$field] != '');
-			}
+//			}
 		}
 		if (!$res) $this->FieldErrors[$error_field]['pseudo'] = 'required';
 		return $res;
Index: trunk/kernel/units/general/cat_dbitem_export.php
===================================================================
diff -u -r3543 -r3616
--- trunk/kernel/units/general/cat_dbitem_export.php	(.../cat_dbitem_export.php)	(revision 3543)
+++ trunk/kernel/units/general/cat_dbitem_export.php	(.../cat_dbitem_export.php)	(revision 3616)
@@ -509,7 +509,7 @@
 			
 			// create/update categories
 			$backup_category_id = $this->Application->GetVar('m_cat_id');
-
+			
 			foreach ($this->curItem->CategoryPath as $category_name) {
 				if (!$category_name) continue;
 				$category_id = $this->getFromCache('category_names', $category_name);
@@ -545,6 +545,9 @@
 					$this->Application->SetVar('m_cat_id', $category_id);
 				}
 			}
+			if (!$this->curItem->CategoryPath) {
+				$category_id = $backup_category_id;
+			}
 			
 			// create main record
 			$save_method = 'Create';
@@ -751,7 +754,7 @@
 				$category_path = $this->Conn->GetOne($sql);
 				$category_path = explode('>', $category_path);
 				
-				if ($this->exportOptions['IsBaseCategory'] ) {
+				if ($this->exportOptions['IsBaseCategory']) {
 					$i = $this->exportOptions['BaseLevel'];
 					while ($i > 0) {
 						array_shift($category_path);