Odd problem
 

I'm pounding my head against a wall on this one.

I've got a few users who are wanting to send up 10-60mb PDF files* and where I can send them up fine* when anyone tries to download them* they get a "could not be saved* because the source file could not be read."

This error only appears on files over 10Mb.

I'm stumped* and my research isn't finding anything.