Hi Joel,
The Microsoft updates mentioned in the thread linked by Brian may not yet be available through standard Windows Update, but you can download and apply them manually, or push them through WSUS or other means.
I did want to mention that this hotfix build of SEP 14 RU1MP1 (14 RU1MP1"a" - 14.0.3892.1101) was pulled from distribution since Microsoft patches resolved the SEP system tray icon issue the hotfix was intended to address. It may be easier to simply revert back to the previous version of 14 RU1MP1 (14.0.3876.1100) if possible. That said, the hotfix build is fully supported, so if you need assistance for this please open a case. If you want to share the case number here or in a PM, I can help ensure it is handled properly. Thank you.