Disable the rotate-sb-plugin and remove it using application manager.

Reinstall the rotate-sb-plugin from http://www.internettablettalk.com/fo...&postcount=194

See if that helps. If not, it may be the kernel :/ and I shall try and help you with reflashing the original to see if it is that (I only have a N800 to test on, so I don't know about the keyboard)