Instead of 'if task.Terminated' use

if WaitForSingleObject(task.TerminateEvent, 0) = WAIT_OBJECT_0 then

I do agree that this is my problem - bad object interface. Terminated signals whether the task has been fully stopped, not whether it should terminate.

* Breaking interface change * - IOmniTask.Terminated renamed to IOmniTask.Stopped. - New IOmniTask.Terminated that check whether the task has been requested to terminate.