G'Day Brian,
Mate, did it play up in the DVD player/TV and the PC ?
Shaun has 'stomped' labels onto the discs.
I found from my experience that the labelled discs 'play-up'. I believe the process of stomping labels throws the balance out and discs can them become problematic.
Solutiuon.....

if you have a DVD Burner, copy the disc to your hard drive, then rip another disc.
Otherwise, call Shaun and explain what you disc was doing, requesting a replacement.
How are those flight demos Eh!
Cheers,
Mitch.