Wikimedia Bugzilla is closed!

hi ...
when I resize images like [[image:learn.jpg|300px]] it doesn't show any image
(thumbs) and doesn't give me any error ...just an empty rectangle of the thumb
size (300px) with X sign at the top left of that empty rectangle !!! .... I
tried something I found in one of the forums, to commented these lines (in  
\wiki\includes\Image.php):

#$cmd = $wgCustomConvertCommand;
#$cmd = str_replace( '%s', $src, str_replace( '%d', $dst, $cmd ) ); # Filenames
#$cmd = str_replace( '%h', $height, str_replace( '%w', $width, $cmd ) ); # Size

And instead add this :
$cmd = $wgImageMagickConvertCommand .
" -quality 85 -background white -geometry {$width} ".
($this->imagePath) . " " .
($thumbPath);

It works with them but didn't work with me!!!

* I'm sure that the converter works because when I opened the image/thumb
directory I found thumbs with the sizes I've tried on.
* I gave permission for both the IUSR_* and IWAM_* on both the Image directory
and the whole directory that contains the the "convert" ....

waiting for your help 
regards,