Re: Cannot select DB error!
Did you change that from how it was working before, or did you recently upgrade to 0.83? I ask because 0.83 made the switch to db-mysqli.php and as far as I know db-mysqli.php does not accept the port parameter (the part after the localhost:)
So, was it working before and it stopped all of the sudden or did you upgrade something that might have broken it.
If you upgraded to 0.83, I think this ticket might be of interest to you:
https://trac.bbpress.org/ticket/745
https://bbpress.org/forums/topic/bbpress-on-localhost?replies=4#post-12105
