I also have the same issue as above (on PC).

Wulbren is sitting in Last Light Inn. Every time I speak to him he mentions he needs to get to Baldur's Gate and Ketheric must die. Quest won't progress.

So now on my conscience are the gnomes not being saved and Wulbren not being saved. Yeah I did actually do some of the saving, but quest log says I didn't - my character is starting to become very confused.