We had some similar problem, WmMonitor 6.0.1,
Processes remained in status started forever in the monitor, even though they were completed.
We also didn’t get an acknowledgment when submitting the documents to the broker.
On the service usage statistics there were 9 instances for the service wmPRT.handleControlEvent. And they seemed to remain there forever, though not sure if they weren’t related to the “stucked” processes.
Use the latest DD driver solved the issue.
HTH
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