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 tried to switch from menu version 3.3.19 to 3.4.07. I replaced the file mmenu.js by the new one and keep menu_array.js but now the submenu don't appear anymore.
I have to do something to switch to the new version ?