Mini tape won't work in PD-150

I have a friend who recorded approximately 50 minutes of audio onto a MiniDV tape and now when he inserts the tape into any miniDV player it gives him the yellow eject symbol.
The camera is in VTR mode and it doesn't matter if the record inhibit is engaged or not.

He's tried the tape in several cameras with no success.
(And yes, he's inserting the tape correctly)

Has anyone else had this happen before?

Thanks,
Jason