Someone please help me out?

I'm trying to submit an entry for the latest Loves competition like other competitions I've entered on Threadless, but I keep receiving the message: "Woops! You either did not select an image to upload or the file size is too large"

So I go back to check and double check the file size too make sure I have it all ok:

100x70 pixel thumbail: 4 kb gif
640x800 pixel design: 156 kb jpg

Having entered multiple times before with similar or larger file sizes I'm baffled. All I can think is something is wrong with the Threadless server? Anyone know?

Deadline for the design is tomorrow!