Hi Shuv-Oohl and The Imp:
I have been playing Bone Hill many many times in mega-mod games without fatal errors. This is the first time that this occurred. I never get to finish a game because of other fatal crashes with the BGII - SoA section of BGT. Every time I start a new mega-mod game, I use the latest mods. Every new mega-mod game has fixed some old problems but always introduces new fatal problems. Usually the "new" problems worked properly with the previous mods.
Computer programs should go through two processes called Verification and Validation. In essence, you must prove the program did what it was intended to do and did it correctly while disallowing incorrect inputs. That process is super difficult with mods because of the large number of them, but not impossible.
Also, many mod authors have their own opinion of how to play the game and they try to force it on the players. This makes it difficult to install many mods without one interfering with another.
I still do not know what happened to Rhialto. I think the author of that mod may be unhappy that someone else cause that mod not to work.
Tom