Is this problem resolved? I have very same problem now. My WP is new, and I have no similiar plugins switched on. ALso, I tried to change permitions to 777 for any possibiliy connected folders, and I checked the other methods of uploads in settings on the top.
Meanwhile, I can see that files ARE uploading, I can find them on server, and if I use import from NEXTGEN gallery – this also worked…
Any advice?…