I upgraded my Samsung Galaxy S GT I 9000 to Android 2.2 yesterday...but I just can't open my messages...it says Force Close every time I try...any solutions??
If not, how can I downgrade to the original 2.1 Eclair?
Try clearing the cache of the Messaging app.
From the home screen:
Menu | Settings | Applications | Manage applications | All | Messaging | Clear cache
If that doesn't work, I'd try the following, in this order: