If a user is added as a member of a group, NWAdmin and ConsoleOne actually perform 4 actions:
If any of these actions fail, the eDirectory references for the user and group are inconsistent.
You will only have noticeable problems with users and groups.
In the Application Launcher it doesn't list apps assigned to a group, for which the group says that the user is a member, but for which the user doesn't list the group in it's group membership list.
The program only checks the tree, you will have to fix the errors yourself.
Feedback is appreciated.