diff --git a/importexport/inc/class.importexport_helper_functions.inc.php b/importexport/inc/class.importexport_helper_functions.inc.php
index 4627483ba3..b4a90826b1 100755
--- a/importexport/inc/class.importexport_helper_functions.inc.php
+++ b/importexport/inc/class.importexport_helper_functions.inc.php
@@ -15,9 +15,11 @@
  * use importexport_helper_functions::method
  */
 class importexport_helper_functions {
-	
-	// Plugins are scanned and cached for all instances using this source path
-	const CACHE_EXPIRATION = 86400;
+
+	/**
+	 * Plugins are scanned and cached for all instances using this source path for given time (in seconds)
+	 */
+	const CACHE_EXPIRATION = 3600;
 
 	/**
 	* Files known to cause problems, and will be skipped in a plugin scan
@@ -31,10 +33,10 @@ class importexport_helper_functions {
 	/**
 	 * nothing to construct here, only static functions!
 	 */
-	
+
 	/**
 	 * Converts a custom time string to to unix timestamp
-	 * The format of the time string is given by the argument $_format 
+	 * The format of the time string is given by the argument $_format
 	 * which takes the same parameters as the php date() function.
 	 *
 	 * @abstract supportet formatstrings: d,m,y,Y,H,h,i,s,O,a,A
@@ -48,7 +50,7 @@ class importexport_helper_functions {
 		$fparams = explode( ',', chunk_split( $_format, 1, ',' ) );
 		$spos = 0;
 		foreach ( $fparams as $fparam ) {
-			
+
 			switch ( $fparam ) {
 				case 'd': (int)$day = substr( $_string, $spos, 2 ); $spos += 2; break;
 				case 'm': (int)$mon = substr( $_string, $spos, 2 ); $spos += 2; break;
@@ -64,10 +66,10 @@ class importexport_helper_functions {
 				default: $spos++; // seperator
 			}
 		}
-		
+
 		print_debug("hour:$hour; min:$min; sec:$sec; mon:$mon; day:$day; year:$year;\n");
 		$timestamp = mktime($hour, $min, $sec, $mon, $day, $year, $_is_dst);
-		
+
 		// offset given?
 		if ( isset( $offset ) && strlen( $offset == 5 ) ) {
 			$operator = $offset{0};
@@ -92,7 +94,7 @@ class importexport_helper_functions {
 			}
 		}
 		return is_array( $_account_lids ) ? $account_ids : implode( ',', (array)$account_ids );
-		
+
 	} // end of member function account_lid2id
 
 	/**
@@ -110,19 +112,17 @@ class importexport_helper_functions {
 		}
 		return is_array( $_account_id ) ? $account_lids : implode( ',', (array)$account_lids );
 	} // end of member function account_id2lid
-	
+
 	/**
 	 * converts cat_id to a cat_name
 	 *
 	 * @param mixed _cat_ids comma seperated list or array
-	 * @return mixed comma seperated list or array with cat_names 
+	 * @return mixed comma seperated list or array with cat_names
 	 */
 	public static function cat_id2name( $_cat_ids ) {
-		$cats = &CreateObject( 'phpgwapi.categories' );
-		
 		$cat_ids = is_array( $_cat_ids ) ? $_cat_ids : explode( ',', $_cat_ids );
 		foreach ( $cat_ids as $cat_id ) {
-			$cat_names[] = $cats->id2name( (int)$cat_id );
+			$cat_names[] = categories::id2name( (int)$cat_id );
 		}
 		return is_array( $_cat_ids ) ? $cat_names : implode(',',(array)$cat_names);
 	} // end of member function category_id2name
@@ -135,52 +135,51 @@ class importexport_helper_functions {
 	 * @return mixed comma seperated list or array with cat_ids
 	 */
 	public static function cat_name2id( $_cat_names ) {
-		$cats = CreateObject( 'phpgwapi.categories' );
-		$cats->app_name = $GLOBALS['egw_info']['flags']['currentapp'];
-		
+		$cats = new categories();	// uses current user and app (egw_info[flags][currentapp])
+
 		$cat_names = is_array( $_cat_names ) ? $_cat_names : explode( ',', $_cat_names );
 		foreach ( $cat_names as $cat_name ) {
 			if ( $cat_name == '' ) continue;
 			if ( ( $cat_id = $cats->name2id( $cat_name ) ) == 0 ) {
-				$cat_id = $cats->add( array( 
-					'name' => $cat_name, 
-					'access' => 'public', 
+				$cat_id = $cats->add( array(
+					'name' => $cat_name,
+					'access' => 'public',
 					'descr' => $cat_name. ' ('. lang('Automatically created by importexport'). ')'
 				));
 			}
 			$cat_ids[] = $cat_id;
 		}
 		return is_array( $_cat_names ) ? $cat_ids : implode( ',', (array)$cat_ids );
-		
+
 	} // end of member function category_name2id
 
 	/**
 	 * conversion
-	 * 
-	 * Conversions enable you to change / adapt the content of each _record field for your needs. 
+	 *
+	 * Conversions enable you to change / adapt the content of each _record field for your needs.
 	 * General syntax is: pattern1 |> replacement1 || ... || patternN |> replacementN
-	 * If the pattern-part of a pair is ommited it will match everything ('^.*$'), which 
+	 * If the pattern-part of a pair is ommited it will match everything ('^.*$'), which
 	 * is only usefull for the last pair, as they are worked from left to right.
 	 * Example: 1|>private||public
 	 * This will translate a '1' in the _record field to 'privat' and everything else to 'public'.
-	 * 
-	 * In addintion to the fields assign by the pattern of the reg.exp. 
+	 *
+	 * In addintion to the fields assign by the pattern of the reg.exp.
 	 * you can use all other _record fields, with the syntax |[FIELDINDEX].
-	 * Example: 
-	 * Your record is: 
+	 * Example:
+	 * Your record is:
 	 * 		array( 0 => Company, 1 => NFamily, 2 => NGiven
-	 * Your conversion string for field 0 (Company): 
+	 * Your conversion string for field 0 (Company):
 	 * 		.+|>|[0]: |[1], |[2]|||[1], |[2]
-	 * This constructs something like 
+	 * This constructs something like
 	 * 		Company: FamilyName, GivenName or FamilyName, GivenName if 'Company' is empty.
-	 * 
+	 *
 	 * Moreover the two helper function cat() and account() can be used.
-	 * cat(Cat1,...,CatN) returns a (','-separated) list with the cat_id's. If a 
+	 * cat(Cat1,...,CatN) returns a (','-separated) list with the cat_id's. If a
 	 * category isn't found, it will be automaticaly added.
 	 *
-	 * Patterns as well as the replacement can be regular expressions (the replacement is done 
+	 * Patterns as well as the replacement can be regular expressions (the replacement is done
 	 * via ereg_replace).
-	 * 
+	 *
 	 * @param array _record reference with record to do the conversion with
 	 * @param array _conversion array with conversion description
 	 * @param object &$cclass calling class to process the '@ evals' (not impelmeted yet)
@@ -188,7 +187,7 @@ class importexport_helper_functions {
 	 */
 	public static function conversion( $_record,  $_conversion, &$_cclass = null ) {
 		if (empty( $_conversion ) ) return $_record;
-		
+
 		$PSep = '||'; // Pattern-Separator, separats the pattern-replacement-pairs in conversion
 		$ASep = '|>'; // Assignment-Separator, separats pattern and replacesment
 		$CPre = '|['; $CPos = ']';  // |[_record-idx] is expanded to the corespondig value
@@ -199,7 +198,7 @@ class importexport_helper_functions {
 
 		foreach ( $_conversion as $idx => $conversion_string ) {
 			if ( empty( $conversion_string ) ) continue;
-			
+
 			// fetch patterns ($rvalues)
 			$pat_reps = explode( $PSep, stripslashes( $conversion_string ) );
 			foreach( $pat_reps as $k => $pat_rep ) {
@@ -209,25 +208,25 @@ class importexport_helper_functions {
 				}
 				$rvalues[$pattern] = $replace;	// replace two with only one, added by the form
 			}
-			
+
 			// conversion list may be longer than $_record aka (no_csv)
 			$val = array_key_exists( $idx, $_record ) ? $_record[$idx] : '';
 
 			foreach ( $rvalues as $pattern => $replace ) {
 				if( ereg( (string)$pattern, $val) ) {
-					
+
 					$val = ereg_replace( (string)$pattern, $replace, (string)$val );
-					
+
 					$reg = '\|\[([a-zA-Z_0-9]+)\]';
 					while( ereg( $reg, $val, $vars ) ) {
 						// expand all _record fields
 						$val = str_replace(
-							$CPre . $vars[1] . $CPos, 
-							$_record[array_search($vars[1], array_keys($_record))], 
+							$CPre . $vars[1] . $CPos,
+							$_record[array_search($vars[1], array_keys($_record))],
 							$val
 						);
 					}
-					
+
 					$val = preg_replace_callback( "/(cat|account|strtotime)\(([^)]*)\)/i", array( self, 'c2_dispatcher') , $val );
 				}
 			}
@@ -238,10 +237,10 @@ class importexport_helper_functions {
 		}
 		return $_record;
 	} // end of member function conversion
-	
+
 	/**
 	 * callback for preg_replace_callback from self::conversion.
-	 * This function gets called when 2nd level conversions are made, 
+	 * This function gets called when 2nd level conversions are made,
 	 * like the cat() and account() statements in the conversions.
 	 *
 	 * @param array $_matches
@@ -249,7 +248,7 @@ class importexport_helper_functions {
 	private static function c2_dispatcher( $_matches ) {
 		$action = &$_matches[1]; // cat or account ...
 		$data = &$_matches[2];   // datas for action
-		
+
 		switch ( $action ) {
 			case 'strtotime' :
 				list( $string, $format ) = explode( ',', $data );
@@ -259,40 +258,36 @@ class importexport_helper_functions {
 				return self::$method( $data );
 		}
 	}
-	
+
 	private static function strclean( $_matches ) {
 		switch( $_matches[1] ) {
 			case '|T{' : return trim( $_matches[2] );
 			case '|TC{' : return trim( preg_replace( '/[\x01-\x1F]+/', '', $_matches[2] ) );
 			case '|TCnCL{' : return trim( preg_replace( '/[\x01-\x09\x11\x12\x14-\x1F]+/', '', $_matches[2] ) );
-			case '|INE{' : return preg_match( '/\^.+\^/', $_matches[2] ) ? $_matches[2] : '';	
+			case '|INE{' : return preg_match( '/\^.+\^/', $_matches[2] ) ? $_matches[2] : '';
 			default:
 				throw new Exception('Error in conversion string! "'. substr( $_matches[1], 0, -1 ). '" is not valid!');
 		}
 	}
-	
+
 	/**
-	 * returns a list of importexport plugins 
+	 * returns a list of importexport plugins
 	 *
 	 * @param string $_tpye {import | export | all}
 	 * @param string $_appname {<appname> | all}
 	 * @return array(<appname> => array( <type> => array(<plugin> => <title>)))
 	 */
 	public static function get_plugins( $_appname = 'all', $_type = 'all' ) {
-		/*
 		$plugins = egw_cache::getTree(
-			__CLASS__, 
-			'plugins', 
-			array('importexport_helper_functions','_get_plugins'), 
+			__CLASS__,
+			'plugins',
+			array('importexport_helper_functions','_get_plugins'),
 			array(array_keys($GLOBALS['egw_info']['apps']), array('import', 'export')),
 			self::CACHE_EXPIRATION
 		);
-		*/
-		$plugins = self::_get_plugins(array_keys($GLOBALS['egw_info']['apps']), array('import', 'export'));
-
 		$appnames = $_appname == 'all' ? array_keys($GLOBALS['egw_info']['apps']) : (array)$_appname;
 		$types = $_type == 'all' ? array('import','export') : (array)$_type;
-	
+
 		foreach($plugins as $appname => $types) {
 			if(!in_array($appname, $appnames)) unset($plugins['appname']);
 		}
@@ -302,7 +297,7 @@ class importexport_helper_functions {
 		return $plugins;
 	}
 
-	protected static function _get_plugins(Array $appnames, Array $types) {
+	public static function _get_plugins(Array $appnames, Array $types) {
 		$plugins = array();
 		foreach ($appnames as $appname) {
 			if(array_key_exists($appname, self::$blacklist_files) && self::$blacklist_files[$appname] === true) continue;
@@ -310,7 +305,7 @@ class importexport_helper_functions {
 			$appdir = EGW_INCLUDE_ROOT. "/$appname/inc";
 			if(!is_dir($appdir)) continue;
 			$d = dir($appdir);
-			
+
 			// step through each file in appdir
 			while (false !== ($entry = $d->read())) {
 				// Blacklisted?
@@ -318,12 +313,12 @@ class importexport_helper_functions {
 
 				list( ,$classname, ,$extension) = explode('.',$entry);
 				$file = $appdir. '/'. $entry;
-				
+
 				foreach ($types as $type) {
 					if( !is_file($file) || strpos($entry, $type) === false || $extension != 'php' ) continue;
 					require_once($file);
 					$reflectionClass = new ReflectionClass($classname);
-					if($reflectionClass->IsInstantiable() && 
+					if($reflectionClass->IsInstantiable() &&
 							$reflectionClass->implementsInterface('importexport_iface_'.$type.'_plugin')) {
 						try {
 							$plugin_object = new $classname;
@@ -339,9 +334,9 @@ class importexport_helper_functions {
 			$d->close();
 		}
 		//error_log(__CLASS__.__FUNCTION__.print_r($plugins,true));
-		return $plugins;	
+		return $plugins;
 	}
-	
+
 	/**
 	 * returns list of apps which have plugins of given type.
 	 *
@@ -353,7 +348,6 @@ class importexport_helper_functions {
 	}
 
 	public static function guess_filetype( $_file ) {
-		
+
 	}
 } // end of importexport_helper_functions
-?>