Save error returns [object Object]

If you're using chrome or firebug, are you getting any error messages in the debug log?

Also, check the request in the network tab to see what the response is to the save request. Is it coming through as a 200 response, and if so, what is the response?

At one point the module didn't work well without clean urls, but I think I fixed those path issues before.

Great, thanks for the update. I will try and make the error messages more useful than [object object]. I believe I know the reason for this.

Something like that (quick and dirty, for discussion only) in css_live_save would give you better information. But this is not enough, there can be many different errors when trying to save a file. Using File API like suggested in #1506590: Use file API for saving files would provide more information about the actual errors.

//save file back
  $fh = fopen($path, 'w');
  if($fh !== FALSE){
    fwrite($fh, $css);
    fclose($fh);
    $result = 'success';
  }
  else {
    $result = "Can't open file " . $path;
  }

  echo drupal_json_encode(array(
    'result' => $result,
    'filename' => $path
  ));

By the way, on the same topic, this js alert was displayed because on my installation, $_SERVER['DOCUMENT_ROOT'] already ended with "/".
So adding it again creates an incorrect system path with "//" in the URL:

  $path = $_SERVER['DOCUMENT_ROOT'] . '/' . $path;  

So we need to sanitize paths better, but I guess this goes along the rewrite of the overall function.

Have updated the error reporting code. Please let me know if you have any more issues with incorrect error messages.

edit explained