WordPress 3.3.2 multi site installation
WPMU DEV's Google Maps plugin
WordPress MU Domain Mapping plugin
What I noticed in using BWP Minify on a multi site setup, is that it used the url for the main blog to call js-files from all the other sites. So the page source for example.com shows a call to js-files on maindomain.com. Don't know if this has anything to do with it, but though I might as well mention it.