Environment: TDI 3.6.6 on RHEL

I have a project that is a singleton that the controller somehow thinks is still running somewhere.

Therefore, when this flow tries to run, it eventually fails with many messages that say:

Deferring Execution: This project is a singleton and an instance is already running.

However, I can find nothing running on the runtime tab or in the process history that an instance is already running.

I restarted the node(s) to no avail.  I also think the controller server has been restarted.  However, I'm not positive.

I opened the derby database on the controller but everything looks okay to me.  I figured proc_project would be the place to look.  However, all records for the project version show complete/failure/disposed/killed.

How can I straighten the controller out?

Thanks for your time.