we have recently installed Joomla1.0.10 and have integrated Community Builder v1.0 and Joomlaboard 1.1 Stable.
users registered in Community Builder are not listed under Joomlaboard Forum user list.
we are having problems in making Community Builder and Joomlaboard talk to each other.
however we have sucessfully integrated the above 2 components with Joomla1.0.3 without any problems
in the back end of joomlaboard there is that "integration" tab, and inside that section where you click community builder there is a >>click here<< ... did you ever click this or even set the integration to cB?