Recently one of my client have started using Splunk Enterprise. Splunk services seems to be interfering with DRM, especially with the DRM's task event process that writes to windows event.
Symptoms:
When drm services are restarted, none of the engines or other processes are able to start. windows event viewer does not capture reason or any errors related to drm.
Fix: currently only fix i found was to kill the Splunk service and then start drm services.