So I have played Ifan and the Red Prince since the start of the game as two Lone Wolf characters. I am now at the Lunar Gate.
The game crashes when I click on the Lunar gate. There should be a conversation at this point I think, but the conversation never quite starts. Whichever character clicks on the gate disappears completely along with the entire UI. I am left with whatever character didn't click on the gate standing with no-one to talk to and no possible actions.
Thinking that a possible solution might be to dismiss the Red Prince I tried that but this also crashes the game. The camera switches to the Red Prince on the Lady Vengeance and then just stops. Once again the UI has disappeared and I cannot perform any actions or change to Ifan.
I have gone back through all autosaves and quick saves and in every case when I dismiss the Red Prince the same thing happens.
Whether related or not I had noticed earlier in the game that at some point I could not separate the two characters. I can drag them so that the 'chains' are broken and they appear to be separate but moving either one moves both.