After completing "We'll Make an Aspirant Out of You", I mounted up and tried to take flight by pressing the space bar. Nothing happened. Even after taking a flight master to another zone, it was still not working. Space bar seemed to be mapped now to my '4' key instead.

Reloading UI fixed it, but I imagine this is not the intended behavior of the addon. :)

Oddly enough, this problem seemed to be fixed, but today, again after the same WQ as noted above, I'm having the same issue as before. Space bar doesn't work and seems to activate the '4' key.