Favorite bugs in the remaster (Assassin's Creed 3)

Guys, is there anyone fumbling for a remaster of the third part for the PC? There are three questions.
1) I can’t buy a light cavalry saber in the store, because the condition is to get a blueprint from the chest in part 7, in Boston, although I have already collected all the chests in the game. how to be? what's the meme?
2) does not count the store in the frontier. I go into it and writes they say "not visited". Although I buy and sell there, I even sent a caravan ... How to be?
3) in New York, it is not possible to recruit the last assassin, in the northern part of the city. Hanging quest to help the locals with food, remind them what to do.
Thanks in advance everyone!