Wedge

This seems related to your system. Can you share your PHP configuration please?

Um, I'm using a virtual machine to debug and host the forum, and still able to reproduce this on my Windows 7 machine.

Everything works as expected after a page reload, it gets buggy when you frequently click on the items.

Perhaps this related to Windows?
Don't know. Could you test it on an VM with Linux?

I'll be disabling the click problem soon.

This is all in script.js, in the mm() plugin. Just look for it.
First thing I did was to get rid of the 'plugin', and directly assign the search on $('.menu') items, in the only place where .mm() was called.
Then, I got rid of it entirely, and went for an alternative route: automatically hiding/showing menu items when leaving a page or landing on a page. Unfortunately, it doesn't seem to be working as well for me on Chrome, so again: will look into it tomorrow...

In the meantime, for the curious, I've uploaded that file on wedge.org, so you can test here if you want.

:edit: Working great on IE 10, for all I know...! :)

I get the same thing again.
Browser: Firefox 30
Wedge: latest

Nothing here for me...

Only appears in Firefox, works well with Chrome :hmm: