One per thread or just not two uploading simetaneously? It probably has to do with resizing software to fix the issue with people uploading huge photos and then wondering why they won't upload.
I'm not saying yours are bigger, but new software was installed for when people try to upload really big ones. I think it might be the cause of your problem.
I can no longer load multiple pics at a time , only one at a time , PITA Is there a way to do it or Can this be fixed , changed ???
Currently it's givd or take. Ive tackled the issue of the too big pictures everyone was havi g problems with, this one is a direct result of that. Until I can find a way to make both problems go away, this is what we've got.