If you ever get an error of any kind, hit the back button and reload the page. That's how it seems to work on my end. Actually I thought the same about jpeg and jpg too.
I think JPEG wasn't there but JPG was as allowed file extensions. Here's what I have as allowed file extensions. Tell me if I'm missing anything.
Currently allowed extensions: doc,gif,jpg,mpg,pdf,png,txt,zip,bmp,vpt,zip,xml,jpeg (just added now)
You want to hear a story? I was playing with some friends, and the ball came down- with real blood on it!! No shit! Must've hit a bird in flight.