I am having the same problem. I can't upload images to my listing and get the same error message. If I look at a listing which I created a few weeks ago I can see the listing but without the image I had successfully uploaded when I listed it. If I look at someone else's listing I can see their image.

I do not have the add-on mentioned in another post and have never had this problem before. This is particularly annoying as I was just about to begin scheduling my CD/LP auctions for 1st August. Help!!!