diff --git includes/common.inc includes/common.inc
index 651eb6a..330bc64 100644
--- includes/common.inc
+++ includes/common.inc
@@ -3334,6 +3334,7 @@ function drupal_build_css_cache($css) {
   }
 
   if (empty($uri) || !file_exists($uri)) {
+drupal_set_message("building css cache($uri)");
     // Build aggregate CSS file.
     foreach ($css as $stylesheet) {
       // Only 'file' stylesheets can be aggregated.
@@ -3369,9 +3370,12 @@ function drupal_build_css_cache($css) {
     // Create the css/ within the files folder.
     $csspath = 'public://css';
     $uri = $csspath . '/' . $filename;
+drupal_set_message("saving file uri($uri) (after 10 second sleep)");
+sleep(10);
     // Create the CSS file.
     file_prepare_directory($csspath, FILE_CREATE_DIRECTORY);
     if (!file_exists($uri) && !file_unmanaged_save_data($data, $uri, FILE_EXISTS_REPLACE)) {
+drupal_set_message("save failed.");
       return FALSE;
     }
     // If CSS gzip compression is enabled, clean URLs are enabled (which means
@@ -3379,12 +3383,15 @@ function drupal_build_css_cache($css) {
     // create a gzipped version of this file. This file is served conditionally
     // to browsers that accept gzip using .htaccess rules.
     if (variable_get('css_gzip_compression', TRUE) && variable_get('clean_url', 0) && extension_loaded('zlib')) {
+drupal_set_message("saving gzip version of file.");
       if (!file_exists($uri . '.gz') && !file_unmanaged_save_data(gzencode($data, 9, FORCE_GZIP), $uri . '.gz', FILE_EXISTS_REPLACE)) {
+drupal_set_message("gzip save failed.");
         return FALSE;
       }
     }
     // Save the updated map.
     $map[$key] = $uri;
+drupal_set_message('updating map: variable_set(drupal_css_cache_files)');
     variable_set('drupal_css_cache_files', $map);
   }
   return $uri;