Having trouble using responsive feature of Superfish I am using the Superfish module for Drupal 7.x, and the menu itself works as advertised. However, no matter what configuration options I try, I cannot get the main menu to change into a select menu when at smaller screen sizes. It just attempts to render the original menu (which, of course, becomes a mess at smartphone size).  I'm not even sure where to start looking for a problem.  Any clues would be appreciated!
I ran into the same problem a while ago, and wound up writing some javascript/css to convert a multi-level superfish menu into a windowshade-style menu. It wasn't very elegant, though, and I later found the Responsive Menus module - it was very easy to set up, from what I remember, and worked with Superfish right out of the box. It also provides several styles of mobile navigation -- though not a select menu, if that's specifically what you want.