Having the same problem. To answer "sharondippity", after the phone boots up I get this message that says "Unfortunately, Homescreen has stopped". Then when you select "Ok", it just keeps bringing up the same error message - essentially making the phone unusable. Force Reboot doesn't help. Clearing Cache didn't help.
One option that at least makes the phone usable again, is going into "Settings - applications - all", find the homescreen app and select "Clear Data". This gets you out of the error message loop. I added all my homescreen apps and everything seemed to be working fine. However, the first time I powered my phone off - then back on, the error message came back and the phone was locked up again.
I also just booted my phone into Safe Mode, and it seems to be working OK - which I believe means it's not the phone itself, but instead one of my downloaded apps.
That's as far as I've gotten so far.