Well, in my haste to try to adapt some of the code for the modifications submissions, it looks as though I had a few errors.. go figure..
I think I have all the quirks fixed now. Should be no problem to upload gif or jpeg images, and all seems to be fixed with modifying your listing. Sorry about any inconvenience with this.
I would really like to urge everyone to try to scale down pictures as necessary - once a photo gets wider than 420-460 pixels wide, it makes viewing a little more difficult... If you need help in scaling down your photos, perhaps try posting in the Photo Exchange portion of the boards to see if someone would offer their assistance as needed. If you truly strike out after trying all other options, send an email my way and I'll see what I can do to help you out.
Enjoy!