I've been having the very same problem. Everything will be fine for a while, and then I can't add images or choose a template or schedule an auction, and if I don't catch it quick enough, I can't even save the listing I've been working on! The only thing I've found that helps is to reboot the whole computer and that takes 10-15 minutes or more. Very frustrating. Any ideas what I can do to solve this problem? Thanks!!