If you experience a chaotic menu screen which makes it so you can't read or select anything, go into the "modifier" tool and set the main menu option to original.

I originally posted this error as a request for a solution. I then edited it with my solution since the issue didn't reappear immediately, as I had expected. However, this bug (screen going completely crazy to the point that you can't see anything) forces me to exit to windows. It's not technically a crash and there doesn't seem to be a cause. It just happens once in a while, then I quit, restart and load my game and continue on undisturbed for sometimes hours before it reoccurs. Any idea why? Has anybody else experienced this? This problem isn't so bad that it forces me to attempt a reinstall, since it really is just a short inconvenience, but it would be interesting to know if anybody else has witnessed it (and fixed it).

I haven't experienced it myself, but it could also be a hardware issue, due to temperature (overheating), overclocking (CPU and/or GPU) or faulty GPU memory.
Try playing on low settings and disable graphical enhancements in your graphic card's control panel as well as any overclocking or boosting technology (CPU and GPU). See if that makes a difference in terms of this glitch.

Thanks for the tips DeMignon. I'm not overclocking anything, and I just upgraded my RAM and bought a new GPU. True, it could certainly be faulty. I'll try out some other games and see if it continues to act up. However, if it were the GPU, wouldn't it continue acting up in Windows?

No, not necessarily as Windows is a pure 2D environment and uses only a fraction of your GPU's capability. A lot of hardware issues only appear under considerable load. That's why some benchmarks and tools offer stress testing.

OK, I finished the game with the ZRP and that was the only bug I had. No idea what causes it because now I'm playing Call of Pripyat on the absolute highest graphics settings and I have no issues. I may also start Alan Wake just to test out the graphics card and memory again, but I don't think that's what's causing it. Since nobody else has had this issue though, we can just overlook it as an outlier. It wasn't a big deal anyway, just when I would go to the menu it would act up maybe 5% of the time, and increase in probability the longer I stayed on the main menu screen.