Build and Shoot

I've been playing openspades alot on my new pc, and i have a problem. it runs fine and everything, but im getting glitches where random lines, shapes and glitched stuff will appear randomly on the screen. i've tried to take screenshots but to no avail cause they are flashing rather than staying on screen for a while. it has to do with openGL, something weird that happens in all opengl games. if anyone knows what's wrong i could use some help

Are your drivers up-to-date?

Try lowering and/or disabling lighting settings, see if that stops the problem.

Have you tried to lower all the graphics settings and then to see if the problem persists?
If you did not, do it!
If the problem goes away, try to insert them one at a time, so you'll understand where is the problem.
In any case need some more information on the system where you are playing:
O.S.
CPU
Video driver
etc

+Video card
then set "r_ignoreGLErrors 0" and see what the console (black box + white text) says
try setting "r_OptimizedVoxelModel 0", because I used to have problems with this on old releases (0.0.9 - 0.0.10)