I've searched and searched for a solution to this problem and I have found nothing. I've tried everything. I deleted the unwanted Adobe Save For Web Prefs (it for some reason reappears the second I tap Save For Web inside of Photoshop), i've uninstalled and reinstalled Photoshop, i've change the file type and size. I even opened the file in both Mac and Windows and the problem is cross-platform, i've updated my computer to OS X Yosemite, i've updated my version of Photoshop, i've read forums after forums, and there doesn't seem to be a fix for this bug yet. Not sure what to do. I need to be able to create GIF's in Photoshop for my job.