Hi ccormier1973,
Did the issue only happen to specific SFB MAC client?
Based on your description, did you mean that there is no issue with windows client?
Please try to upgrade the SFB MAC client to the latest version then test again.
Here is a blog describes how to troubleshooting Lync for MAC, it is for your reference
http://communicationsknowledge.blogspot.sg/2016/03/how-to-troubleshoot-lync-for-mac-issues.html
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Regards,
Alice Wang
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