Spoiler: The sad story ;-;Okay, so with vid_renderer 1 GZDoom (newest dev build, g8169991) crashes at startup. I included crash report.
(much?) Older version of GZDoom I still have on my hard drive (gfd76723) works perfectly fine (hehe, not really, but that's case for an another report :3: ). No crashes. Is it related to that modern-gl thingie I heard about?

The graphic card is "ATI RADEON XPRESS 200 Series". I know it sucks (it was built in, duh) but hey, older versions didn't crash.