Updated & ran this build OK for 5hrs approx.
Subsequently shut down & restarted PC & now hangs on splash screen at ''Loading extension : Explorer Panel'' statement.
Needs to be terminated via Task Manager. Running as Admin on win10 x64.
Following Lukasz' comment, I altered the end section of the
ExplorerPanel.xml file & MC then correctly starts.
I.E.
<DelayUpdate value="1"/>
<onlylocal value="0"/>
<onlylocked value="0"/>
<itemfocus value="1"/>
<sort value="1"/>
<<<< I commented out this trailing extra block>>>>
<!--<DelayUpdate value="1"/>-->
<!--<onlylocal value="0"/>-->
<!--<onlylocked value="0"/>-->
<!--<itemfocus value="1"/>-->
<!--<sort value="1"/>-->
Closing MC reverts to lock-up at next start with
ExplorerPanel.xml being incorrectly formatted again.
Need your help Mathias