[1.5.06 & SVN r1281] Fullscreen is blank black screen.

[ETTiNGRiNDER]

GZDoom is no longer running properly in fullscreen mode for me. It just gives a black screen, though everything else works. It still displays all right in windowed more.

It seems to have begun when I set up my new screen for widescreen resolutions, or at least that's when I noticed it (I don't use GZDoom much, but it didn't have this issue before.) Switching back to an "ordinary" resolution on the card settings didn't help, though, so I'm not sure if there's an actual connection or not.

The video card is an ATI Radeon HD 4200. I made sure the drivers are updated and the GZDoom is the latest SVN version, though I did also try downgrading GZDoom to the latest official release (which made no difference). No corresponding problem with regular ZDoom, Doomsday or newer games, either.