HVM host Can't Power off

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Hello,
I am currently testing HVM version 8.0.6,
but I am unable to shut down the HVM host from the GUI.
When I select the HVM host on the GUI and select [Actions] - [Stop],
there is no error, nothing is recorded in the history, and it does not shut down.
What's more, even though the HVM host is in a started state, the [Start] button is clickable.
When I click this, it remains in the activity list and an alert-like message is periodically displayed.
Is this something that is happening in your environment?

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It is not called HVM host, but VME host. Sorry if that is confusing.