After upgrading to 10.9, I've been seeing some horrible graphics glitches in the shadow backdrops of pretty much all my windows. Here are some screenshots: http://i.imgur.com/OhvXEUq.png http://i.imgur.com/DBOOvFL.png http://i.imgur.com/j4B1yjm.png A reboot temporarily fixes it, but it comes back the next morning. I'm using a MBP from early 2010 with the 520m i5 and an nVidia 320m and Intel HD graphics. Before this, I was running 10.7 for a couple years with no troubles. Any help would be appreciated.