It sounds like you are getting an error somewhere and so the game just doesn't finish the request of popping up the combat team window. I just did a fresh install of the v0.5.25 game and then dropped my navinfocombo directly into it from the zip file I uploaded and combat team button and team selection all comes up correctly and works fine for me.
Are you using any other mods?
Are there any warnings/errors in the game's secondary window?