I just updated to 3.0.5912.0 and the Collections view is broken again. This happened on an older version where my users would be able to see ALL collections, even those in libraries they did not have access to. For example, all users on my system are able to see all collections on my server - Movies, Shows, and Adult. The solution has been to lower the allowed parental rating to sub-XXX as those collections have that rating, but on the flip side the "Adult" user can see all of the regular movie collections which are in libraries that user does not have access to.
I am running MBServer on Server 2008R2.