For me nothing appeared to happen when I clicked the load second level button. May be I was being impatient though as you said it sometimes take a long time to load.
The menu is detecting the mouse position as being offset up to an inch or so on some machines. Eg, as being higher or lower than in actuality. It isn't happening to me on my own machine and it is the built in ui code, so I haven't been able to debug it yet. Sorry about that
