Can't manage my users in 5.6.0.2

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Hello! We recently updated to 5.6.0.2 and I can no longer properly manage my users.... Before the upgrade I could add them to groups, update their profiles (change their passwords if need be, fill in a new field, etc.), and ever since we upgraded I've been unable to do anything other than delete a user.

Am I just not doing some new step that I'm unaware of, or is this a glitch in this version of Concrete? Any help would be much appreciated!