Wrong aspect ratio on LVD-2001?

Our LVD-2001 (firmware 0299) has worked flawlessly since we got it a couple of months ago.

Today, though, something odd happened. I made a DivX CD with a 16:9 (letterbox) file. It plays fine on our PC, but on the LiteOn, it appears in 4:3 (full screen).

I’ve tried manually selecting 16:9 on the LiteOn’s setup screen (usually not necessary), but it doesn’t help. Any ideas why this is happening, and if it can be fixed? Thanks!