Howdy,

Microsoft just released November 2014 update for Lync 2013 clients which can be downloaded from the following links

this update fixes the following problems

  • 3010340 Video freezes consistently for two second-intervals when you make a video call in Lync 2013
  • 3009723 Incorrect format of string in a trace statement when application sharing session viewers stop viewing in a conference
  • 3009722 Memory leak occurs when you start a peer-to-peer application sharing session in Lync 2013
  • 3009721 Lync 2013 crashes when you join a meeting that is hosted on Lync Server 2010 as an anonymous user
  • 3009719 Lync 2013 freezes when a toast notification of a call appears

details can be found in the release article here