Re: I cannot post forum topics?
I have been trying to help you!
Try Dashboard > BuddyPress > Forum Setup and then reinstall and set up a new bbPress installation. It sounds like something is wrong with your bb-config.php.
If nothing else works, and you don’t yet have any content in your installation anyway, you should consider wiping your database and starting from scratch. Clearly something has happened that is keeping BP from communicating with your bbPress database tables.