Domain Mapping Plugin causing constant super admin logouts

Hey there... I had a topic open at

https://premium.wpmudev.org/forums/topic/cookies-from-both-www-and-not-on-multisite#post-624349

but it seems to have dropped off the radar, so I'm re-opening this one. When I have the domain mapping plugin enabled and I edit sites on my network as a superadmin, I'm logged out every minute or so. Very annoying. If I enable the plugin, I can map a new domain, and then disable the plugin - the domain keeps working and I can work without getting kicked out - any ideas?