I recently installed Lync Server 2013 on a Windows Server 2012R2 for the first time.
Although everything worked just as before I noticed that Lync Server Management Shell would not start – it would just hang with a blank window without the prompt. No error or indication as to what might be the problem.
To get around it I simply launched the “regular” PowerShell and ran a
import-module lync cmdlet. After this “Lync PowerShell” can be used just like before.