I had the same problem with darkplaces a while ago discussed in this thread:
Never found a cure.
I just tried hammer of thyrion and am getting the same issue. Anyone else having this issue of the screen flickering everytime a level loads? If I tab out of Hexen and go back, the flicker stops, but it happens again once I enter a new map section.
It will also go away if I change and apply resolutions, but it happens again next time I enter a new area. I also noticed that the loading bars do not seem to move right before it starts to flicker.
Using the latest version and running the gl exe. The software one works fine.
The gl_ztrick doesn't help. The game and desktop are running at 32 bpp.
Here's my specs:
windows xp. service pack 3. gateway laptop with centrino duo.
Mobile intel(R) 945 express chipset family
Vendor 8086 device 27a2 subsys 461107b revision
loaded d3dx version 42 (d3dx9_42.dll)
Running in fullscreen 800x600x32
Windowed mode doesn't seem to have the same problem, but I can't stand windowed mode. :(