Re: User management, WP and BBP
Are either of you using a translated version of bbPress, or are you both using English?
I ask because I have heard of a strange thing or two with capabilities and non-enlish languages (though I’ve newer been able to confirm or reproduce).
Do you have the “bb-press integration” plugin installed in your WordPress blog? https://trac.bbpress.org/attachment/ticket/438/bbpress-integration.php
(the download link is way at the bottom)