[Plugin: Maintenance Mode] MM with WP 3.0 Multisite

I’m wondering if anyone else is having this problem while testing 3.0RC1 with multisite:

Maintenance mode works for each site, but will not allow admins for some sites into the backend.

Here’s the example of what’s happening:
Site 1: MM Disabled
Site 2: MM Enabled
Site 3: MM Enabled – was the last one to enable

Site 1 and 3 will work fine. Site 2 will show the MM screen, but not allow admins to enter

Note: I am running a few select plugins, none of which have problems while running MM on WP 2.9 (not MU). I AM running the domain mapping plugin for the multisite.

http://wordpress.org/extend/plugins/maintenance-mode/