Can't Upload Pictures?

Snapfish was letting me upload pictures to my albums and then all of a sudden, it stopped working. Now, when I hit upload, regardless of whether it's to a new or exisiting album, it will pull up the screen to track my progress of the uploads but, no matter how long I wait, it is stuck on 0% uploaded. The photos are the same size and file type as many of the others it let me upload previously and I've tried varying the number of photos and which ones I've tried to upload. I haven't changed anything. Any idea what's going on?