ICS upgrade - Contacts freezing on Galaxy S2 This morning I upgraded my Galaxy S2 from Android v2 to ICS, using Settings/About/Software Update.  Since doing so, I am encountering a problems with my Contacts, which crashes practically every time I open it.  Major downer, not to be able to look up my contacts, as I'm sure you can imagine.

(I also have a problem with Hebrew fonts, which no longer display correctly - but I've opened a separate question here to deal with that.)

I have tried doing a factory reset, as suggested in one of the answers, which I originally accepted, because it seemed Contacts were working OK right after the reset - but later, after the rest of my apps were automatically downloaded and reinstalled, the same problem started happening again.  

Are there any apps that are known to conflict with Contacts in ICS?  Everything worked fine when I was on Android 2.  Any other ideas how to fix this?
I would try to backup as much as possible and then factory reset the phone. This gives you a fresh start, so that alone might resolve your problems, or if they still occur after the factory reset you know they're not caused by any data or applications that didn't survive the upgrade to well.