First, thanks for the plugin -- it's been a great addition to my site.
I've run into an incompatibility after upgrading to WP 3.7.1. BP Group Documents doesn't play well with Widget_Logic. On their own, both plugins work fine, but together, not so much -- I get a blank white page due to having a completely empty html source. Both worked together in WP 3.6.
I've posted a message on Widget_Logic as well. Any help in resolving the incompatibility would be appreciated.