Here is a quick fix for you guys who alt tab and get graphic problems every so often. Go into your console and type record "something" and hit enter to start recording a demo. Then type stop, hit enter, this stops the demo. When you start recording a demo, TF2 is set to correct graphical errors, if possible, to get a proper demo. So once you do that it should straighten things out.
I have tried this. It usually works.
Here is a quick fix for you guys who alt tab and get graphic problems every so often. Go into your console and type record "something" and hit enter to start recording a demo. Then type stop, hit enter, this stops the demo. When you start recording a demo, TF2 is set to correct graphical errors, if possible, to get a proper demo. So once you do that it should straighten things out.