Hi
not that i have heard, a DVD is just a media storage tool the same as a pendrive or external hard drive.
Its possible that they may have accidentally blanked the dvd without realising it or the images and video are in a format they cant open, it may be that you didnt close the session when writing the images to the disk..
or...they only have a CDrom on their PC and as such it wont see the DVD,,seen that before.
Just some thoughts