https://i.gyazo.com/a89ea299100fa23427996ee2a4ca8e19.gif This happens every sim I go to, all of the time. Why? D: Edit: I don't know how to reply to your comment so I'll just edit.. Specs are windows 7 64bit, i7 2.6-3.6 ghz, nvidia 670mx, 8gb ddr3 ram... uhhh.. what else is relevant? Firestorm, latest version, just did a complete clean install a couple weeks ago. Edit2: I disabled atmospheric shaders, but ambient occulsion is greyed out. However, disabling atmospheric shaders SEEMS to have worked. I'm using a modular laptop with removable fans and keep the exhaust system maticulously clean, other than the fact that the parts are ~5 years old I can't think of a reason why the video card would be crapping out so I HOPE that's not the case. I'll keep an eye out for the symptoms and report back if the problem hasn't been fixed. Thank you both for your help. :D