You can launch BB if you hover over the page in the page list and click the BB link.
BB is network activated.
Metabox.io is network activated.
BB Themer is network activated (deactivating it doesn't make a difference)
(I don't think network activation has anything to do with this conflict though).
This is reproducible even if nothing else is activated.
Is this a known issue? Any ideas for a workaround?