Just doing some basic testing with ZCM 2017 Agent for Mac. Mac is running macOS Sierra (v10.12.6) and the ZCM Agent version is v17.1.0.1347.

Clicking on the Agent icon in the menu bar brings up the ZENworks Agent window showing the properties. If the user presses the standard Mac 'quit' keyboard shortcut of 'command+q' while this window is open the Agent icon disappears from the menu bar while the ZENworks Agent window remains open, unable to be closed. The ZENworks Icon service then shows a 'Not Responding' state in Activity Monitor, and does not recover on its own.

Is this normal behaviour? Thanks.