At first it wouldn't play at all, but that was because I didn't have the PowerDVD software that came with the two Dell Inspiron 600m laptops installed. After installing it, the DVD would play. But when I checked the "repeat" setting in Windows Media Player, the DVD won't repeat.
It's not that the DVD is protected from repeating in all cases. I tried playing it in the standalone DVD player in the apartment, turning on repeat, and it's merrily repeating away in the living room as I type this. But I can't get it to repeat on the computers.
This is highly annoying. I don't want to have to haul my DVD player along to Westercon, but I also don't want to have to keep hitting play every 3 1/2 minutes on one of the laptops; that's just silly.
I suppose it might be something wrong with PowerDVD software supplied with the computers. I note that PowerDVD is now two versions later than the OEM version 5.1 that came with these two Dells. But I hate spending money on software without knowing whether that's the problem or not.