LordPotato - thanks for raising this! Would you still mind sharing the game name and page where you're seeing this? We are attempting to locate and address all bugs associated with Experimental Performance Enhancements so all of our users can experience the performance benefits it brings. We would appreciate any detail you can provide since we're not able to reproduce this broadly. LordPotato said: Hello, the lines used to block light in the light layer no longer appear, even in the light layer itself, when drawn. Only doors and windows remain visible.