Only two minor technical glitches. One video had the misfortune of overloading the DVD player and stuttered on two occasions. Granted, the show DVD had been tested on another player, and had worked fine, so that was not foreseeable. The second issue was that a few videos had MPEG-2 encoding glitches (you'd recognize them if you saw them - flashes of black blocks or a red screen). The two issues may be related. It's possible that the DVD's were encoded with too high a bit rate, which can overload some DVD players.
Just curious, was mine one of those? It behaved badly at another convention (perhaps at others, as well, but no one's said anything) and I've done my best to warn contest coordinators about the potential for it to act up. In fact, there are issues I've seen that no one else seems to notice as technical problems, mostly the audio and video going slightly in and out of synch, which of course throws everything off. When it played at Anime Boston, I sat there wincing for four minutes straight because the synch was so messed up - I could barely stand to watch. If this happened at AX, too...
(And if it wasn't mine that caused the technical glitches...I'm very sympathetic because I know how it feels. )