I just started getting the following message today when using the NSMAdmin, "An error has occurred. An OS function has failed."

Nothing with NSM has been updated or altered in the last few months and this month's updates to the OS have not been applied yet.

Could this be an indication that something it relies upon within AD has a problem? I do not see any errors within the log other than some NSMSentinel Warnings "Heartbeat message sent & NAK'd; reply message status=10. I've had these before but not the "...OS function has failed."

NSM Engine Version:
OS Build Version: MS Windows x86-32, Platform ID: 2, Version: v5.2, Build: 3790, SP: v2.0 [Service Pack 2], Product Type: 2, Suite Mask: 0x112.

Any thoughts?