I had the same problem. Its the IP. I have tried to use cracked software and after reg, i only could upload 1 file at the same time. I have spent 3$ and get reg key. After this, the problme was solved.
Entertainment Reviewed by Entertainment on . Zoom uploader: only 1 upload possble at a time! why?? d/nt getting whats the prob with me!!!!! today zoom uploader(File uploader),showing me,I can upload max 1 file at a time(in my setting),normally it does support upto 8 parallel upload. its just happened to me, in my RDP :( in my pc its okay(supporting upto 8 parallel) whose the fault is it? its my RDP or IP or any unknown? Rating: 5