Cannot open video

So this is driving me crazy. 

We have 3 ipads, 2 of which work fine with the drive, but the third doesn’t.  all have the latest version of ios7.  The one that doesn’t work is a mini but I don’t see how that could make a difference.

The ipad connects fine, sees the files,  when I open file it give me the “leaving app” message, but then I get “cannot open file.”

Could it be a itunes issue?  I signed in with the correct itunes account on the device, but for imessaging it’s still signed into a different ID.

Really I can’t see how 2/3 ipads with same ios would work and the third not.

Thanks in advance.