Fixed it! I went to the Saved Games folder, find the "Inputs" sub folder and delete all the UH1 folders in there. You now have default controls, but the menus work.
Just narrowed it down. The Huey is the problem, if I remove it, it works fine, and I can change the control options for the A10, Su25, ROTC.
If I reinstall the Huey, selecting the Controls tab brings the hour glass and it just hangs.
I updated to 1.2.5 and now when I select Options and Flight Controls, I get an hour glass and nothing happens.
In the drop down menus I cannot see any of the aircraft I have installed.
I have tried "repair installation" but to no avail.
Anything else I can try?