OS X :: After Updating To 10.6.6 / Several Icons In Dock Were Replaced With A '?' Icon?

Yesterday I upgraded my mid-2010 MacBook Pro to 10.6.6 using the combo update. I have never had any problems with this Mac, until now.The problems were apparent right from the first post-update login; several icons in my dock were replaced with a '?' icon.

Being fairly knowledgeable about simple problems like this, I instantly dragged the '?' off the dock and re-added the application icons to the dock. That worked fine. So I turned my Mac off and walked off.However, when I turned it on, the problem reared its ugly head again. The dock went back to exactly how it was prior to me rearranging it.Brushing it off as something minor, I opened up iTunes to sync my iPad. This went fine until it got stuck syncing my contacts. I have tried to sync it multiple times with no luck. It simply won't let me sync it. I reinstalled iTunes, thinking that it may fix the problem. Still nothing.

Frustrated with my situation, I opened up Safari, and began to type something into the search bar. Safari froze up and crashed. Now, whenever I stay in Safari for more than a few seconds, it crashes. Again, I reinstalled it, to no avail.I figured that perhaps something had gone wrong in the update progress, so I decided to apply the update again. Still nothing.If anyone else is experiencing similar problems, or has any possible fixes for my problems, I'd love to hear about it.I don't like to jump to conclusions, but it seems as though this update was pushed out as quickly as possible in order to launch the Mac App Store, without much bug-testing being done.