sometimes the server gives me trouble. I would try uploading 1 at a time, and if that works, try bumping that number up 1 at a time till it stops working again. my magic number that always seems to work for me is 3 pics uploaded at a time, then I process about 5 at a time. It gives me an error when processing too, but if you go to the gallery after you get the error message you will see how many of the photos were uploaded before the error, and then you start from their processing again. takes a while, but you gotta do what you gotta do to share the pics! hope this helps and isn't just a problem I deal with and not your problem right now at all, haha.
-Meeks