Problems in FMSE

1# So, i have a save managing Botafogo (SP), and when i try to edit a player that's in my main squad the editor doesn't recognize this player, in fact, he doesn't even exist, not even by UID:

Album: https://imgur.com/a/gimZAKL

That doesn't happen only with this player, i have another one called Plinio with the same thing, he doesn't exist in FMSE.

2# When i remove unhappiness of a player, the next day he's already unhappy and complaining again, i don't know if it's a FMSE or FM issue, but that's so annoying.

3# The Swap teams, still crashing after selecting the club.

It's amazing how everything in this software is completely lackluster and doesn't work as intended, i'm starting to questioning even the CA/PA.

1) My guess is that those players must be player/staff. Players who are nearing the end of their career and have a staff profile too. These are a different type of person which FMSE doesn't currently support.

2) Remove unhappy cannot permanently solve all possible cases of his unhappiness. If the player is unhappy for a specific reason, e.g. for being transfer listed, he'll likely become unhappy again soon.
You could try adjusting his jadedness too, see if that helps.

3) What is crashing when swapping teams? FMSE or the game?
We've tried a swap now. Player's window closes once you do the swap, nothing crashes. Click save and swap is done in-game.

everything in this software is completely lackluster and doesn't work as intended, i'm starting to questioning even the CA/PA

I'm sorry you feel that way, but honestly... that is overly dramatic, almost insulting. You just brought up a couple of specific features of FMSE out of 100s.