I just ran into a problem I have no idea how to fix with Theodore Roosevelt's America. I'm not sure if it's the CPP or not.
I subbed on Steam to Roosevelt, (who is perhaps the cleverest modded civ I've seen so far, and I love a military focused diplo victory civ, it's like the exact opposite of Venice) and read through the comments to learn there was an issue with him regarding social policies that requires the Community Patch to avoid, even though it's not listed as a requirement. I did run into that afterwards, testing with CP off for the real issue I have, so you probably ought to list it as a requirement, as he definitely is unplayable without the CP. At least he's incredibly unfair without it and will end up running into a 'cannot end turn' scenario if he unlocks all of the social policies as one of those comments stated.
In my working game, with only community patch 3-7 installed, none of the other balance changes or gameplay additions, I built a cargo ship and sent it to trade with a city-state. Upon reaching this city-state, the cargo ship unit disappeared from the map entirely, and also disappeared from my trade unit limit. I was at 2/6 and then suddenly 1/6. The trade route was still there on my the map and if I moused over it it showed it was active, but the unit had disappeared. The route still showed in my trade overview as well, and when the route was scheduled to end the ship reappeared in its home city to be reassigned.
I didn't really stop playing or save it because I had a dumb, I suppose, and I've not yet sat down to try and reproduce it, but by the end of the game it was really bothering me. I didn't take advantage of it, but even at my trade unit limit, once they were all engaged in trade and had disappeared I noticed I could set my cities to build cargo ships and caravans again. It's a minor thing, I suppose, but I'd like to find out if anyone else's encountered it and whether there's something I've done wrong or something I can do to fix it?
PS - I also wonder if the CP didn't screw with the AI, because William of Orange and Isabella of Spain were building massive navies of 10 and 15 caravels at a time and sailing them back and forth, but I think that's a question to ask the CPP folks, even if I have no earthly idea where or how to ask.