Article: OS X 10.9.2 Update
For those of us having the issue of iSight not working, or the continuous crashing and restarting of VDCAssistant: There is a discussion on the Apple support website which suggested that the cause was Air Display (or any program that re-arranges the display output, number of screens, etc). As for me, I uninstalled Air Display, and the problem was solved, both on my Macbook Pro and Hackintosh.
Otherwise, my only other issue is that Chrome seems to take an unusually long time to start compared to 10.8.x, 10.9.1 on both my Macbook and Hackintosh.