on Macs, iOS, Win - with the latest Safari, Chrome and Firefox - the following code that is part of a little hack of mine, works as expected:
var clickedInstance = hypeDocument.getSymbolInstanceById(element.parentNode.parentNode.parentNode.parentNode.id);
…but not in IE 11 and earlier versions.
Seems to be something with element.parentNode.id…
…as if the levels need to fetch the id is different in IE.