TYPO3 Core

i found a solution for first part (highlighting the page in tree), simply add of one line in tree.js::refresh

refresh: function() {
var r = new Date();
// randNum is useful so pagetree does not get cached in browser cache when refreshing
var search = window.location.search.replace(/&randNum=\d+/, '');
window.location.search = search+'&randNum=' + r.getTime();
this.reSelectActiveItem();
},

but have no idea where the JS error comes from.

The solution for the JS error is submitted as a patch to bug #18403

Resolved, no change required after a long time without further feedback. Doesn't seem to be an issue anymore.