This isn't specific to a wpmu plugin, but I'm not getting much luck in the .org forums so I thought I might try here.
"NetworkError: 404 Not Found - http://subdomain.domain.com/wp-content/plugins/inc/js/effects.core.js?ver=3.3.1"
Because it's a multisite install, that filepath will never exist because wp-content lives at the root: domain.com/wp-content. I can't figure out how to find out what plugin is searching for the js folder in the incorrect location.
The second, perhaps related issue, is when using the Anthologize plugin (not yours) and attempting to drag and drop an item (something that works fine in the Custom Menu space, and seems to share the same style of functionality) I get a "d.ui.ddmanager.dragStart is not a function" error about 26 times.
I've tried deactivating the plugin, but the initial issue still exists, which leads me to believe it's not this plugin, but another one that is messing up where the site is looking for the js directory.
Do I need to deactivate everything and go through that whole thing, or is there a better way to debug this that I'm not aware of.
Thanks in advance for any help you might be able to offer.