Perhaps more of a warning than a FYI - reported to us yesterday via my Behind the Blackboard subscription - an issue that will make Ultra rooms disappear - my Colleague puts it like this on blkbrd-l:
This is an FYI: We are running Collaborate Ultra and have been testing the latest collaborate building block (4.8.1172511) against our staging server and have come across the following known issue:
"Ultra Course Room does not appear if there are inactive users enrolled in a course"
There is a miss type in the article title. Inactive users refers to Disabled users.
It's a fairly significant issue if you have any users that are disabled and enrolled in courses that use collaborate ultra.
Hope this helps and saves some time testing.
Edge Hill University