Case of the Missing Monk
 

I have advanced my Party in ToB up to the final confrontation w/Balthazar, having killed Sendai and Abizagal. When I go to meet Balthazar, regardless of which way into the Monestary (even w.the Crtl+J cheat as the 3d method into the grounds), he is not at his throne. When Saemon takes me there, he betrays me outside the main door and NOT in the throne room. If I go thorough the Cave of the Dead, he isnt there. Anybody else have this happen and what can I do to finally put paid to this foul Bhaalspawn?