Yep, minimize problem is solved with beta!
Everything works great now. Apart from saving changes to config. I made yet another change to a config I made before (by using Copy current profile) but the change wasn't saved: I had to change it again after restarting v5.
Since there is no button to save a profile, I decided to use Copy current profile AGAIN after making the changes: that worked: the new profile had my own desired settings. But it's a weird workaround...
After that I accidently discovered that when you change a self made or previously copied profile and select another one, you get the option to save the profile...!!!
So my logical question is: why isn't there a simple SAVE button...? That would REALLY have saved me a lot of problems getting settings to stick... The things you have to do now to make changes stick are not exactly intuitive or logical imho. Maybe in idea for a next beta?

A save button seems a very logical option that will prevent a lot of confusion, I think.
But all in all I am more than happy with v5! The improvement to the centering is really great! During my last flight I stood up from my chair, walked around as far as I could with my headset on, look at the back of the computer, did all kinds of crazy things, sat back behind the computer again and... the view was centered exactly as it should! With v4 even moving forward a bit too much would require a recentre. v5 is great! Thanks for making it work with TrackIR Pro 4 too...!