I'm not new to BG2, but I thought I'd give it a spin with the advice given in the Baldurs gate 2 essential Mods thread.

Now I've started using the spell animate dead with viconia and aerie and I'm used to it summoning the weak 2hd skeletons, but for some reason this time it summoned ghasts (which granted are more powerful, but is the spell messed up or did they change something between the time I last played?)

Confused.

prototype00

It should only be summoning Skeletons, or at 15+ a Skeleton Warrior.

However, the creature file for the regular Skeletons is named ghastsu.cre, indicating that at one point it was a ghast, but that it was changed into a skeleton. The creature is definitely SUPPOSED to be a skeleton, though. One of the mods you installed must have changed something.

Errgh, looks like I'm going to have to do a re-install. There are so many variables that can change in BG2, it's hard to keep track.

prototype00