I got warning: filesize() [function.filesize]: stat failed for sites/default/files/Land_Shark_walk_animation_by_qubodup.svg.preview.jpg in /var/www/sites/opengameart/sites/all/modules/rules/rules/modules/php.rules.inc(105) : eval()'d code on line 10. When submitting http://opengameart.org/node/2274/edit . There was no preview after that (I edited it in later) OGA should stop trying to create previews, if I provide my own.