Soooo we have been playing the game for a long time and encountered a strange bug recently I wanted to share our solution to it since we thought it was all gone.
Situation was like this:
We got into the fight with the help of the emperor and saved the game. We died in the fight and loaded. First thing what was happening I only saw my two characters on the left and not the four of the whole group anymore.
We decided to continue on another day and I the first shock was I could not join the game anymore. We validated data and, disabled cloud saves and what ever was in the internet. THEN we started a new game and everything worked so we loaded in our game from there AND it worked.
We finished the fight only to realize that we can't go through the portal. I (joining player) would always get a waiting for other player. The solution was that I left the game and the other player went through the portal and I rejoined. There I saw now all the character portraits again and after leaving the camp and saving in the Rivington all was normal again.
Maybe this bug is really obscure BUT if it helps someone I thought it was worth to share.