If you applied June Patches for Office 2013, you may encounter a problem that happened to me. I am running Windows 8.1, Office 2013 with June 2015 Office patches.
Suddenly, RMS (Right Management Services) stop working on my machine. If i open an outlook email and I tried to send an RMS protected email, i am not able to do so.
Moreover, i receive the below error when i tried to use RMS from Office 2013:
“Sorry, something went wrong opening Information Rights Management protected content. A certificate is missing or has an empty value for an important field, such as a subject or issue manner”.
It seems that the reason is that I have this Office 2013 June patch installed on my machine (KB3054774). Uninstalling this patch should immediately solve this problem. I have an open case with Microsoft to try to investigate this error. They recreate the environment that I have and they had the same error. Still waiting them to get back to me.