Well, this is totally random, and have been happening to me for the past days. The screen goes crazy and i can't see anything right. I still can type tho so it doesn't have anything to do with my internet. It usually happens after i open the console. It fucks up it and then everything else, and then i have to close Zandronum and re-open it to fix the glitch.
Here are some screenshots:
As i said, it's totally random, so I don't even know when it's going to happen. It's not everytime.
I'd appreciate some help.