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. But maybe it's just me.