I've had Quick Menu working on my site for a while. I guess I never noticed that in IE7 it displays with all the png files expanded showing both open and closed positions reduced to fit on the screen.
It works on the Mac in Safari, and Firefox, and on the PC (Vista) in Firefox. I only see the problem in IE7. I added the javascripts to my index.php page and set the config.
The site is
http://www.dirt.com.
I just downloaded the module today and reinstalled it and I still see the same problem. One note: when the page first loads it looks ok, but after about 2 seconds the png files change size and squeeze the entire image into the alloted space for the slide action.