I stumbled upon this post when trying to search for a solution to the problem I'm facing with my MacbookPro 4,1 (early 2008), similar to what many of you posted here.
I, too, upgraded from 10.9.1 to 10.9.2 only a couple of days ago, and noticed my system seemed to be getting very sluggish. A look at the Activity Monitor showed my COU going through the roof, with process called CrashReporter hogging it most of the time. I then looked into Console, and found a process called VDCAssistant going through a constant loop. It complained about something to do with display drivers.
I then stumbled upon this thread, and whilst I don't have Air Display or AirParrot installed, I do have Air Server installed. I uninstalled it and rebooted. I've also made sure that my Skype doesn't start upon login
Since then I no longer get the CrashReporter hogging my CPU, and the VDCAssistant errors hasn't showed up in Console. However, my FaceTime is still reporting no camera, and when I launch Skype, the VDCAssistant errors appeared again.
At the moment I am happy as my CPU doesn't go through the roof, and the hard disk doesn't get filled up with the VDCAssistant log errors, but it would be nice go try and fix my camera issues too. Does anyone has any suggestions? BTW, prior to uninstalling Air Server I've tried an SMC Reset and also repaired disk permissions but it didn't help.
Thanks everyone.