
This seems to be related to the version of the menu (just purchased), since the version used to build the menus doesn't seem to do this.
The "real" site is here: http://www.webstudiohelp.net
Due to the issue, I've loaded a previous version of the menu source files (v5.732), although the content is the latest.
I have the exact same layout with the latest source files (5.738) located for testing here:
http://www.sunsetfx.com/Web_Studio_Help/
If you choose from the main categories, then select an item with multiple drop-downs, you'll see how some don't expand. This seems to happen mainly with items to the far right side of the screen.
I've tried a variety of items (menuwidth, etc.), but that didn't seem to affect these sub-menu items.
As I mentioned, this seems to be happening in IE6. A quick check in FF seems to be OK.
Any thoughts?