Description: The game has purple boxes on certain or all objects.
Fix 1: First try updating your video/graphics drivers.
Fix 2 Steam: Try re-installing the game or verifying the game's cache.
Fix 2 Humble/Gog: This is usually caused by failure to extract the .rar properly. Many people have solved this by running winrar(or other zip program) in admin mode, while extracting. Be sure not to close the program before its finished and that you extract all the contents of the .rar