Created an account just to say this
Now I'm probably the only person left using Hyperspin but had the same issue and figured out this that might help anyone else.
Turn off the loading fade for future pinball from the launcher program
Since launching future pinball always launches the editor first then the actual table, something with the order and the fade shifts focus back to the wrong place randomly.
Hope this helps
Tried launching in admin mode, compatibility settings, fullscreen, windowed, etc....