Not quite sure what might cause this, but tested with 2 chars. One of them gets flying mount (lvl 50) and the other gets ground mounts and is (lvl 46). I ended up skipping the draenor intro (not taking the quest and flying into portal) on the lvl 46 the character can fly if i force a flying mount, but addon does not automatically select them for me.

I am going to be restarting development on this. I will look into this shortly.

Started leveling a new char aswell in draenor, still the same after unlocking flying and having done the intro.