I installed an update for Domain Mapping today and now I can't login to the non-main sites

So now that I've installed the latest version using the default wordPress plugin updater, I can't login to the non-main sites.

Each login attempt just takes me back to the login URL and adds "?redirect_to=http%3A%2F%2F[THE DOMAIN]%2Fwp-admin%2F&reauth=1"

this was working this morning before I did the update, now I can't update my blog....

Please advise ASAP