Cheers fellas - the house is quite complex, so rebuilding it simply isn`t an option as my assignment has to be handed in soon
As for func_wall - are you sayin I need to make every wall and floor in the house a func_wall?
If this was the case with the rendering properties causing it, wouldn`t it like that from the beginning of the game, rather than just when I hit escape.
I`m also pretty sure its not a graphics card issue as it happens on 3 different machines, all with different cards, drivers, and ones a laptop