Tech: Android Contacts bug!

So, I have a new Android MyTouch 3G phone and have discovered that I get an occasional error when accessing select contacts in my contact list.  It says, "the process android.process.acore has stopped unexpectedly" - this is a "force quit" type bug and I've tried rebooting the phone, taking the battery out & waiting, deleting & resynching all my contacts... almost nothing has worked. I'm reluctant to do a factory reset, so I just tried deleting and re-ADDing one of the offending contacts.  It works again.  So I guess that's the solution.

I SUSPECT that the problem is probably related to TasKiller, which I was/am using to stop background processes.  I've occasionally noticed something to do about contacts running that I didn't launch, so I stopped its process.  That probably messes things up.  Oh well!  I tweak too much.