I've seen this in the base game and we are now getting it in the Ultimate Mod.
The Ambassador to Italy event is failing each and every time. It will be 5 times in a row (assuming Markus played the event again).
In a game I had versus AI, all my ambassador events failed as well as quite a few Regional Cards. Message would consistenty say, "... event failed" This included bombarding forts, though I had the munition trains, etc...When I restarted the game, it worked.
Anyone have an idea what's going on? Why would sending an ambassador fail? Doesn't it make sense that the Ambassador makes it to Italy (not like he doesn't know where it is), and then simply fail on increasing support?