hi there: i tested this out on another installation, and it worked correctly for me... let me ask you a few questions:
when you saw the issue for yourself, did you use the "Become this user" feature to log in as the mod? Then, can you describe the exact steps you took to add a user to a group, and then remove them?
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Kate Thaete
Groupee Guide: Scriptkeeper
Groupee, Inc.