Symptoms
Assume that you have a full-screen sharing for presenting PowerPoint slides in a meeting in Microsoft Skype for Business 2016 and Skype for Business 2015 (Lync 2013). After the full-screen sharing, you may find that you can't input any messages until you click the participants list.
Resolution
To fix this issue, install one of the following updates:
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For Skype for Business 2016, install the February 6, 2018, update (KB4011662).
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For Skype for Business 2015 (Lync 2013), install the February 6, 2018, update (KB4011678).
Note Lync 2013 was upgraded to Skype for Business in April 2015.
