So you might wanna grab yourself a download of newbb 2
Yes, OK, I will try that again. Last time the upgrade script for Newbb 2 didn't works though. But I will try again and then give some feedback here.
So you might wanna grab yourself a download of newbb 2
As for admin, delete files in /templates_c and /cache to see if it'll help.
I think you have not run thehttp://yourxoopsurl/xoopsupdate.php for your update. This will apply the DB changes which should fix your problem.
It's just overwriting the files with updated ones, and then clicking 'update' in system admin -> modules in the modules whose code is updated.