First of all, congrats for your awesome menu. I have been use this since the earlier releases.
I came with an error but i can’t fix it. On the next capture you can find an screenshot of a long menu with differents levels of submenus. On the level 1 of the submenu, everything works and no overlapping is made but where i have another submenu, the overlapping occours (on the right side of the screen). First i try to put a z-index value to the submenu but nothing happens, then I try to change the value (rightToLeftSubMenus) to true on the jquery.smartmenus.js but happen the same.
Could you please post an URL to some kind of demo because I am not sure what might be causing it without testing your code? Also please mention what browser you are testing with (or if it happens with all browsers). I will try to check it ASAP.