We are getting this error on one of our MU subdir sites with a particular template.
Warning: imagecreatefromstring() [function.imagecreatefromstring]: Empty string or invalid image in /home/....../public_html/wp-includes/media.php on line 258
Here is line 258
$image = imagecreatefromstring( file_get_contents( $file ) );
The template provider says its a wordpress file creating the issue. They indicated that the GD libaray was not functioning properly but the host TDM, indicated it was with a simple php file.
We removed all 6-8 jpg images from the media folder on that subdirectory with no change.
Any ideas or help would be greatly appreciated...