FYI: Installed the latest 1.9 release, but still no solution for this issue.
So now not only does switching aircraft still not work, but also go to the airport fails in the same way - but the result is slightly different. FSX-SE simply now reports its stopped working and crashes.
Also. During my quick test, there seems to be a lag somewhere as the flight is no longer smooth? I am not sure where the hit is (FPS or somewhere else), but it's noticeable and I have not ("honestly") changed anything other than installing flyinside 1.9.