Several customers are reporting an issue after installing the July 2013 Security Update for Lync 2013 related to icons not be rendered correctly or missing entirely. This issue has been found to be related to other updates missing on the workstation, as those other updates are NOT part of the July 2013 Security Update…but are required for other changes in the Lync 2013 Client to work properly.
In addition to the July 2013 security update for Lync 2013 (KB2817465), you MUST also install the latest Office 2013 updates for MSO.DLL and MSORES.DLL (KB2817491). These are available from Windows Update or downloaded via the KBs.
We are working to have the KB for the July 2013 Security Update for Lync 2013 (KB2817465) updated to include this information.