yep I know and this client on one of the ones you mentioned. If I can just get this upgraded and prove that it works on the site, I can rule out other things. Right now all I can tell you is that it should work and I haven't run into this before. I was one of the testers on this new version so I have experience!

This server was really really slow earlier but that is no longer an issue and the same thing is still happening. blank screen with that file uploaded and no error log.