Symptoms
This issue occurs in one of the following scenarios:
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Scenario 1: A user creates a peer-to-peer desktop sharing session by using Microsoft Lync for Mac 2011 14.0.8 or Microsoft Office Communicator 2007 R2. Then, a viewer in the session tries to switch the shared desktop from full-screen view to actual size in Microsoft Lync 2013.
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Scenario 2:
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A user joins a conference that is running on a Lync Server 2010 server by using Lync 2013.
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A presenter starts desktop sharing in the conference.
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The user switches the shared desktop from full-screen view to actual size.
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Another participant starts desktop sharing in the conference.
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Resolution
To resolve this issue, install the following cumulative update:
2889860 September 2014 update for Lync 2013 (KB2889860)