Distorted Fences and Stairs

Problem

Fences and stairs are shown distorted and as long lines on the screen.
YarrPirateStairsProblem

Cause

This problem can usually been seen with ATI Radeon graphic cards.

Solution

Open the ATI Catalyst Control Center (or download it) in advanced mode and click on Return to Factory Default.

If this solution does not help you or you don’t have a  ATI Radeon graphic cards this can be a first sign of your card getting bad. If that is the case you will see the same effect in other graphic intensive games and it’s not just stairs and fences. 

Credits
YarrPirate for the picture

Further Reading