i had a fatal error. when i was on the tutorial (just for fun), he game locked up and i looke dat the console andit was full with the same error message "ERROR: CSGPlane: :clipWindingToPlaneFront: error in polygon clipper" the game wouldn't close so i had to close it on the task manager. when i started it back up, it wouldn't load. then i tried to start a few times and it eventualy worked.