I have the same problem as danlacher.
If I activate the plugin as network the root-site works, but avery new site gets the upgrade-stuff.
But, if I deactivate and activate the plugin as a normal plugin, the sub-sites work. if I add one picture to a gallery, and then reactivate it as network plugin, the subdomains still work. But, every new one fails.
That’s makes the plugin useless on multi-user-sites at the moment, as you can’t use the %BLOG_ID% on the gallery path. You need to put that manually on every new site.