I’ve not seen this freeze on going in/out of cockpit. But this sounds familiar: since the March update I do have an issue with returning after long photography breaks with the drone camera. When I return in cockpit and plane is on the ground, I find Throttle off and there is no Control-E to start the engine. Instruments frozen. No other choice than Restart… or did I miss a little fuel safety pin or something 
eager to learn…
Anyway, another camera thing (since UK-update?) I noticed is Control-left for look left and Control-right don’t work anymore. I have to set the camera free, point at the window and define a camera key preset.
Yeah home cockpit messes it up… AND make sure you Search your Control Settings, to check if your old key bindings are still there !