Index: trunk/core/units/themes/themes_tag_processor.php
===================================================================
diff -u -N -r3834 -r4526
--- trunk/core/units/themes/themes_tag_processor.php	(.../themes_tag_processor.php)	(revision 3834)
+++ trunk/core/units/themes/themes_tag_processor.php	(.../themes_tag_processor.php)	(revision 4526)
@@ -19,11 +19,12 @@
 
 			if( file_exists($css_path.'/'.$style_name.'-'.$last_compiled.'.css') )
 			{
-				$ret = $css_url.'/'.$style_name.'-'.$last_compiled.'.css';
+				$ret = rtrim($css_url, '/').'/'.$style_name.'-'.$last_compiled.'.css';
 
 			}
 			else
 			{
+				// search for previously compiled stylesheet
 				$last_compiled = 0;
 				if( $dh = opendir($css_path) )
 				{
@@ -36,7 +37,14 @@
 					}
 					closedir($dh);
 				}
-				if($last_compiled) $ret = $css_url.'/'.$style_name.'-'.$last_compiled.'.css';
+				if ($last_compiled) {
+					// found
+					$ret = $css_url.'/'.$style_name.'-'.$last_compiled.'.css';
+				}
+				else {
+					// not found
+					return '';
+				}
 			}
 
 			if (isset($params['file_only'])) return $ret;