Nevertheless, after much troubleshooting, the problem persists. The old client crashes when connecting to the Conflux. In the new client, saves from the old version don't work. Attempting to load old saves causes the new client to crash. I couldn't finish Irina's campaign because of this. Even starting her campaign from the beginning doesn't work.
I started playing as Cyril from Shio-normal.
That's really strange!
By the way, which versions were you using?!