[Help] Assault on braithwaite manor mission bug

[Eezo]

I've tried playing this mission 3 times now. I've tried to restart the game and verify the integrity of the game files. I can't finish the mission. Everytime I go into the house and up stairs, all the enemy NPC's become invisible except for their weapons, then player input become
non-responsive. The last bug, Dutch and the gang bugged out and are now just standing outside the manor after the first shootout section, just before entering the manor. Anyone know how to fix this?

[BADSPistawful]

Try a different "mission" then come back to the problem 1.
Or try switching from dx to Vulcan or vise/versa.