I noticed a minor bug with the constable training Swadian troop types. I ask him to focus on training cavalry, but instead he automatically keeps training Swadian Recruits into archer units. The cavalry option is the only one that seems to be bugged, as setting him to train infantry and archer units are working as intended. The only mod I'm using is Virake's Male and Female Face Replacer Compilation, and it's my understanding that Diplomacy doesn't touch any of the game's textures, so I'm inclined to believe that it's not a compatibility issue.
Thanks a lot for upgrading the mod to the latest version of Warband. After having used Diplomacy for so many years, I can never go back to playing the game without it!