Post Voting - Clashes With Other Voting Plugins

I currently am working on a BuddyPress WPMU site where I have a client who needs a "like" capability for posts which will also post to the internal profile so that users on the site can see projects which are liked by that individual. Since the PostVoting plugin has that capability I am using it on the site, but I also need product ratings for Marketpress.

To fill this void I'm trying to use GD Star Rating which was suggested on another query however when I activate the plugin I get the white screen of death.

All the other plugins I have seem to work fine with GD Star Rating

If there's any way to get the two applications to work together that would be great, but I'm also open to using alternatives.

Thanks in advance,