Re: Can\'t activate BP default theme
yes, super cache was deactivated, all plugins were for that matter, so i think it must have been another problem.
Also this bug only appeared when I tried to activate the theme, an other admin had no such problem. The only thing that worked for me was uncommenting this part of the themes.php:
<?php if ( ! validate_current_theme() ) : ?>
<div id="message1" class="updated fade"><p><?php _e('The active theme is broken. Reverting to the default theme.'); ?></p></div>