Why won't it let my upload?

Every time I try to upload a pic from my computer it(this site) gives me an error saying that "I can't have spaces in it".

I'm not sure why it won't let me upload it, the pic isn't bad(corrupt) and it works everywhere(on the net) else.

I think this warrents a bump . . since it hasn't been replied to, and isn't on the first page. . .