Thanks, Rich. You are correct. I moved the save files from a 3.2.14 game.
Also, not to complain too much, but at least one of the functions displayed by left-clicking a base no longer work and the game needs to be saved and restarted to restore the function. In my case it affected the create TF option. If I select create TF I get no response. I did not try the function using a keyboard command. Might this also be related to the save files? I suppose I should just ditch the game and restart, but my curiosity was up.
You can run your old scenario file in version 3.2.15 with the new map if you edit the base X,Y locations in your old scenario files to match the base locations in the latest OBC41 scenario files. If you don't know how to do this, you can send me the scenario file and I'll fix it for you.
I don't know why you're having trouble with TF creation. I normally use keyboard shortcuts to interact with the game, but I tried using the mouse, and could see no problem. Do you see this issue in all scenarios or just your current one?