Symptoms
A user is displayed two times in a membership list of a Microsoft Lync Server 2010, Group Chat channel. This issue occurs when the following conditions are true:
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A child domain or a child group is added under the Scope tab in Group Chat Administration Tool.
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The user who is displayed two times in the membership list is a member of both the parent and child group, or the parent and child domain.
Cause
This issue occurs because a procGetExplicitRoleList stored procedure is mishandled. The stored procedure is used to pull the membership list for a specific chat room.
Resolution
To resolve this issue, install the following cumulative update:
2514984 Description of the update for Lync Server 2010 Group Chat: November 2011
