When I play tr on my desktop computer I always have this annoying graphic bug:

It happens when shadows are enabled. I have an HD5850 toxic graphic card. Previously I had an ATI x1950 PRO and this issue was still there but it was less severe. I've changed many drivers during the lasts 3-4 years but nothing has changed so far.

With my notebook (amd A8-3510MX + HD6470M), instead, everything is fine: