G'day UnumProvident155, you need to be a bit more specific, are you talking about a video card setting or a setting in trainz? I know that turning off hardware acceleration in CM will fix jumbled graphics with certain video cards.
We need mor information.
Regards
Barrie
Turning down acceleration to nil is mainly used as a diagnostic technique when you encounter problems with an appication of hardware.
It should never be turned down under normal circumstances.