One of my mods appears to be preventing me from changing team settings in team games. When I select team armies in the dropdown on the lobby, two two slot teams are set up as usual, but the drop down bar still says that the game is an FFA and there are no buttons to add slots or change a team to shared armies. Mod list:
That sounds like an issue an earlier version of kodef had. But I assume all your mods are up to date? Try disabling some that are most likely to be the cause.
I've already disabled quite a few. I'll try reinstalling kodef, but according to PAMM all of my mods are up to date so there may be a bug in that. Neither reinstalling kodef nor disabling it has fixed the issue. I'll try and look through some other likely culprits.