I'm trying to troubleshoot a mac that is having slow logins (1-2 min) and shutdowns (1 min). I've reimaged it, cleared all login items, checked out the hardware, started in safe mode, tried creating new accounts, and removed antivirus software. The Console logs are showing one constant error: "WindowServer CGXGetConnectionProperty: Invalid connection 35587".
MacBook Pro (17-inch, Mid 2010)
MacBook Pro - model: MacBookPro6,1
1 2.66 GHz Intel Core i7 CPU: 2 cores
8 GB RAM
NortonMissedTasks - Path: /Library/StartupItems/NortonMissedTasks
SMC - Path: /Library/StartupItems/SMC
SymAutoProtect - Path: /Library/StartupItems/SymAutoProtect
Has anyone seen this before?