How to Clear a Killed or Hung Task in Progress
Issue
If you tried to kill a task in the current tasks queue, or it shows that it has been in progress longer than expected, it's likely that Revit is unresponsive or has crashed.
The task will eventually clear itself out of the list of current tasks, since only the task server can notice that the Revit.exe process is no longer running and mark it as "presumed dead".
The problem is, this could take some time, so if you want to hurry things along a bit you can try the process below.
Resolution
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Log onto the Task Server as the designated Clarity account.
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If Revit is hung, kill Revit using the Task Manager.
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Exit the Clarity Task Tray
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From the Clarity Task Server for Revit desktop icon, restart the task server
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From the desktop icon Launch Task Server, select any version of Revit.