Freerk,
You're missing a ' in the line and it causes a script syntax error.
The corrected version of the fix should be:
edit line:
echo require_js(array('yui_yahoo','yui_event','yui_treeview'));
to
echo require_js(array('yui_yahoo','yui_event','yui_dom-event','yui_treeview'));
Blocks
Course Menu (YUI), no expanded items
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