Bov, have you tried firing up the game by not using the launcher?
Open Windows explorer and navigate your way here...
C: \ Program Files (x86) \ Topgolf \ WGTLauncher \ golf
...inside the golf folder you should see a golf.exe file, double click it to fire up the game. You can do it this way every time if you wish, but an easier way is once the game is running, right click on the games taskbar icon and select Pin to taskbar from the menu. If you fire up the game from that taskbar icon, instead of using the launcher, you might be able to get around your current issue.
Be aware though that if you run the game this way, it will not receive updates.