I've finaly installed brain party on my pr 1.2...

With the leaked version, i couldn't install it, and when i updated it to the official version, the problem didn't disapear.

The solution i found was:

On the "maemo-extras" repo, the catalog was set to find stuff for "fremantle-pr 1.2" only, so i've added a new catalog set for "fremantle" (without the "-pr 1.2"). It solved the issues.