I have three monitors attached to a MacPro running Lion When I restart, the arrangement and resolution of the monitors change in display preferences, and the primary monitor changes as well -- kind of a pain. All changes to display prefs are lost again on the next restart. Everything worked fine in 10.6. I tried deleting com.apple.windowserver.plist with no success. I searched the posts but nearly everything on multiple monitor setups refers to full screen mode. Any suggestions appreciated.