"Close" button after asking a question not reacting

[bestcons]

I am on Joomla 3.6.2 with VM 3.0.18.
After a Question is asked, the system in a new page confirms that the e-mail has been sent and a Thank you message shows up (see attachment).
Unfortunately at this point the button to close the session does not react.
Any sugestion how to resolve this is appreciated.

[jenkinhill]

Check with Protostar to see if that closes - most likely a template issue.

[bestcons]

Used Protostar and Beez3. Same problem, so not sure whether this is a template problem.

[GJC Web Design]

any JS errors in the console?

[bestcons]

There are no indications in the console of JS errors.

[GJC Web Design]

then you need to post a live url

[bestcons]

http://www.oudvorden.nl/beeldarchief/fotos/buurtschap-linde-1/f100001-detail?tmpl=component

[GJC Web Design]

first thing i see

TypeError: window.addEvent is not a function
http://www.oudvorden.nl/beeldarchief/fotos/buurtschap-linde-1/f100001-detail
Line 176

from your no copy thing

<script type="text/javascript">
   /* <![CDATA[ */
      window.addEvent('domready', function() {
         document.body.oncopy = function() {
            alert('U kunt hier geen kopie van maken');
            return false;
         }
      });
   /* ]]> */
</script>

[bestcons]

AntiCopy has been switched off.

[GJC Web Design]

and works now

[bestcons]

Thanks a lot.