Something that's been happening almost continuously -- and I have no idea how it's done:
Someone agros the flight master, and leads it away. Then somehow drops combat with it -- but the flight master does not run back to it's spot.
It's neither dead, nor is it in combat-- but it stays exactly where it was lead to -- and the problem is?
If the flight master is far away from it's spawn point -- even a very short distance away -- you cannot use the flight path, even if you can get the flight path window to come up.
This needs to be fixed. It happens several times per day, especially in Gadgetzan where it's frequently led to the doorway of the Mining trainer. (I have no idea what the significance of the mining trainer is for this bug.)