I've been seeing a lot of vertical lines in a lot of rooms. I think they're just transparent pixels, and they show whatever lighting effects are underneath. I've also noticed they show up on the 'same' rooms.



I'm playing at 1280x720, windowed mode. Here are some screenshots:



screenshots.rar



I see them in every game I play. Here's one I started recently just to find those vertical lines to save all the necessary stuff, and immediately found one one the third room of the first floor:



Files.rar