Assuming it is his computer, any idea what settings in his browser or anything else might cause problems with uploading? I'm just hunting at this point because I've no clue what could be causing this. I have one or two other users mention the same problem. However, there are other users uploading with no problems at all. So I am inclined to think it is not a problem with a setting in Photopost unless there is something I am not aware of that can affect individual accounts without affecting all accounts.