I have upgraded my old Joomla 1.5.26 to the latest version with Jupgrade (have done it with many sites without problems). But now I have problem with Community Builder does not find users after the upgrade. There's a tool "synchronize users" but in CB Field Manager, I can not access the data fields. Joomla has changed to a new prefix, it may be that the Community Builder can not access the database, and how will I be able to fix it in that case?