I just burned a DVD from Disk Utility. It was automatically ejected when the burn finished successfully. I wanted to verify it, so I closed the drive and let it start up in DVD Player.

DVD Player launched, but didn’t start the movie. I hit the play button, and it complained about no supported disc being present. Why? Because I’d switched windows during the burn, and hadn’t come back to Disk Utility and clicked “OK” on the little dialog box that said the burn was successful. Adding insult to injury, when I switched back to Disk Utility, the confirmation dialog box was now under the main window, so I initially didn’t realize that it remained unclicked.

Sadly, clicking it afterwards didn’t help. Apparently I have to reboot to unconfuse the driver. I count at least three bugs here.