Yes as the man above me stated nothing works with 3.0 yet. Winterboard things are not fully compatible, things like keyboards and sms themes are a no go so far.
3.0 screwed with the Messaging app because of a new framework called Chatkit. People are working on it. I have been able to get a few things to work, but it all seems temporary. We may just need to wait for saurik to update winterboard and maybe release some info.