Thank you for the update :)
Tried out the beta version and it works fine without errors in the old areas.
However, on Broken Isles (I'm in beta), it doesn't work at all.
I'm not seeing any errors, but it prevents me from talking to any flightmasters.
Nothing happens when I right-click them.
I'm not seeing any icons on the Broken Isles maps either, but that could be because I'm unable to talk to any flightmasters.
The default flight map (without addons) looks very different on Broken Isle, so Blizzard probably made some major changes here.