Dialogue/Plot Problem at Sarevok's Coronation

I've run into what I believe is a serious dialogue/plot problem at Sarevok's coronation.

Have killed Krystin & Slythe in the Undercellars, obtained an invitation to the Duchal Palace, the note from Slythe and the diary of Sarevok.

Went to the Duchal Palace and witnessed Sarevok's coronation.  Immediately afterwards, the shapeshifters attacked my party, but were all defeated.

However, when I then try to talk with Belt, Liia Jannath or Sarevok, I simply get a "has nothing to say to you" reply.  Without them responding, I think I'm stuck in BG1 without being able to go to BG2.

Attached is a MS Word file showing my mod install list (the official Weidu install log got accidentally left behind/deleted when I used multi-install-tool to move my BGT game to a new folder).

Any advice, suggestions, help would be greatly appreciated.

>> Torvald <<