yeah – my english isn’t the best one. So step by step.
You’re right I mean the crated pages like ‘activity’, ‘members’ etc. I have two different page-tempaltes. The standard-template also known as page.php and and wide-page.php. WordPress suppots switching the themes for each crated Site and all BP connected Pages got wide-page.php but still loading page.php
For the second thing: as provided since BP 1.7 there is no need for a theme migration – so buddypress loads the default theme “bp-legacy”. Also on twentytwelve the problem with the loader.gif exists.
And yes, I didn’t posted a link because we saved the site with a htaccess at the moment.