<p>Try this:
</p>
- Go to the Steam main window and click on the "library" tab at the top. Then right click on the game and click on "Properties". A small window will come up. Find the "Local files" tab and click on "Verify integrity of game files..." This will make Steam automatically replace any possible corrupt game files. This can fix some types of glitches.
- Also, have you updated your "graphics driver" recently?
<p>I can't think of anything better at the moment.
</p>