Buddypress Login Problem

Hi everybody,

after entering login informations in the bp-login widget on a cached page, I see an empty login form, although I am logged in.
The page cache is set to no-cache-when-logged-in, but I think in this case the page is not reloaded, so I still see the cached page version for visitors?
I would very much like to remain my frontpage cached (if not logged in), as it is the first thing visitors see on my site…

The same happens even after logging in via the login-page and going back to the frontpage!

(I run the newest versions of wp and all plugins.)

THANKS 🙂

Achim