Please note that official support for this menu version has now ceased. There are still plenty of users, though, and the forum is still running. Some of our long-time users may be able to help you out.
I'm using version 3.5.15 in my JSP's inside the Struts framework.
My problem is that when I'm coming from a request redirect/forward the menu is not loading. The menu loads perfectly if I ask for the JSP specifically, for example, http://www.myhost.com/menutest.jsp.
When the menutest.jsp is a target for a request redirect/forward it seems like the JavaScript is not loaded or not executed. When checking the code I find that the resulting HTML is exactly the same!
I discovered that because the forward/redirects are executed in a different context then the JSPs my relative paths didn't work. I just replaced them with absolute URLs and voila!
One strange thing is that there was no JavaScript error (normally "Object expected...") telling me that the .js files were not found.