Hi! Me and my friend were playing co-op. It used to work fine but then my character wouldn't be on the screen when I left my house. The camera would be close to his house, while my character would be outside mine. This is the log from my game: https://smapi.io/log/b9da6b5385fc4e45baf3033cf9cc695d
You have a lot of updates to do. Both of you need to update SMAPI to the latest version in order to use the version of Content Patcher that you have, and SVE isn't loading for you because CP won't load. Same thing with TMXL. This seems a bit backwards, but you should actually go back a version of Happy Birthday. The current one is broken pretty badly in multiplayer, but the previous version works fine. Your main issue is needing to update SMAPI, though--that should solve most of your problems.