Microsoft has just released CU7 for Lync Server 2013, which contains some new fixes, especially the clslogging bug that was introduced in the August security update is fixed now.
The update contains these fixes:
3003346 Cannot see presence status or send instant messages when OWA is integrated with Lync Server 2013 instant messaging
3003347 User cannot dial out to a PSTN number as a guest in an online meeting in a Lync Server 2013 environment
3003350 Cannot search users by using a keyword that differs from Lync Server 2013 AD DS display name format in a Lync client
3008181 Centralized Logging Service Agent Service cannot start after you install a September 2014 update for Lync Server 2013
Get the update here