I just downloaded the latest version of the menu today. Using my previous menu_data.js (from version 5.05), I reviewed the impact to my menus and noticed that the itemwidth property did not appear to be adjusting the width of the menu item.
The code in question is as follows:
with(milonic=new menuname("External Sites")){
style=menuStyle;
top=50;
left=616;
overflow="scroll";
aI("text=Capital Markets Group External Sites;status=Capital Markets Group External Sites;url=/externalSites/externalSites_CapitalMarkets.shtml;itemwidth=50;");
Unfortunately, this is on an internal test system (behind firewall). Is there some additional information that I can post which would help you diagnose this problem?