Does anyone know what is required to enable the GD graphics engine for thumbnails other than to uncomment the dll line in php.ini? php info reports the GD engine loaded, but nothing happens to to the images. On the mediawiki site there was text about other lines to include in LocalSettings.php (like the path to the convert command) but I cannot find any file named "convert." Also there are references to two ImageMagick lines to use in LocalSettings.php but nothing equivalent for GD.