I'm having problems with windows in my second monitor (using MBP). When I drag a window between monitors a dark shade appears on the edges. When It's completely in the second monitor the shade disappears, but in a few apps the shade stays there. When I drag it back to my MBP it's gone and it reappears on the second monitor. Not all apps have this problem. I've noticed it on the iWork '08 package, textwrangler, eclipse and coda. I had the problem with vmware, but an update fixed it, so this made me think the software was to old cause iWork '08 isn't updated anymore. But from textwrangler, eclipse and coda I have the latest versions. The second monitor it's happening on is a Samsung SyncMaster 2443. The same happens on a 2443BW, but it all works fine on third different SyncMaster. It might be a driver problem, but this is all automatically on mac so I have no idea how to restore those. Below are two screen shots. The first is from my MBP and the second is from the SyncMaster 2443. Does anyone know what could cause this and what might solve it? EDIT: Restarting didn't solve it in the first place, but after connecting to my dell at home, restarting and connecting again to the samsung it's solved. Though I still don't know what caused it.