Sometimes rendering gets messed up when looking forward. You can see a blue/black void to the left or right of the screen. Althought it is not a big deal, it gets annoying and distracting whilst playing the game.

When you have a FOV near quake pro or on quake pro when quickly turning or simply looking forward you can see Blue/Black void to the left and right of you. It is not a large issue but becomes very annoying. I do not believe this is an issue with my computer, it only occurs from time to time, not 24/7. I am using default textures and do not have any mods installed.