Just threw in The Matrix to check and I found something interesting that makes it rather convenient to check on this problem: start the movie and then stop it (I found this works pretty much any time in chapter 1, but not necessarily in other chapters) and almost immediately after it goes back to the DVD player's title screen the flash shows up. I checked some other discs and they didn't show this . Otherwise it's a pretty quick way to test. Just start, stop, and wait for the flash.