Same thing happened here.
I suspended FIND to allow a VolPex WU to run and found that all of the vina FIND processes were still running in task manager.
I had to end each manually to shut them down.
Maybe a good opportunity to use max_concurrent on that project to limit the number of WU's that won't respond to the suspend requests. At least then you should have most of the system doing the real life stuff it's there for.
I had to move off. I've put those machines on Sztaki instead. That should nearly double my output there. I won't have any machines I can put on FIND for a couple of weeks.
FiND is now running out of work it seems, so the problem may cure itself shortly. I have about a day left then I'm moving on also.