gifs in Image Ready

I recently downloaded PS/Image Ready as a trial and I'm having trouble upoloading the images after I make them. I save them as gifs, but when I try to upload to Photobucket or my LJ scrapbook, it simply won't do it. Photobucket says "invalid MIME" and LJ just says "Uploading, please wait" but never does anything. I can open them with another application and re-save, and then it'll work, but it really cuts down the quality. Any ideas?