Did you start the game with the icon provided ? It has stack increased there and happens to be more stable doing it that way.
Hopping that the dhewm.cfg provided is used, some tip: You can gain extra video/ram memory disabling image_useAllFormats ( to "0" ). At least less is used in my system.
Game has been worked over the months as far as I got with opengl functions failing. One of the tests I've done fixes the stutter with VBO's when increased requirements are needed but makes game a little slower but the slower parts aren't so much.
Nothing done for extra mods from my part. Still a lot to do with recent changes but hopping for a new tinygl release to fix whole bunch of things.