I am having the same issue. Sometimes after so long I just close the internet window out and go back to my account and see that the upload took.

However, tonight it's not even uploading the zip file just the pictures. I got the dreaded IO error within 1 second after hitting upload on a 22mb file and it took me straight to my account page where I can see all the uploads I have. It showed the new ones I was trying to upload (at seperate times) under my uploads tab but it's just the pictures and not the file. So I deleted uploads until it gets fixed.