The application is now automatically tracking upstream deployments: Releases · mavlink/qgroundcontrol · GitHub. If you download the latest there, you will be good to go.
Not on today’s latest. Recording video using the QGroundControl - #7 by williangalvani
Check the documentation here for a complete description of the behavior: Redirecting...
No, there is no feedback on which you are currently on (because this was a hack in the first place, not intended to be a long term api)
As described in the post, a bug in the algorithm was causing poor performance. You may have increased your pid gains previously to compensate for this. The bug is resolved, so now your pids may need to be adjusted again. You can restore the default values from the Frame tab in the Vehicle Setup page.