Hello, I installed or modification and tweaks according to this topic: http://www.gog.com/news/enhance_the_gameplay_in_your_edition_of_baldurs_gate_from_gogcom. I started a new game of BG1 and fought the rats in the warehouse when strange thing happened to me: I use staff since it is the only weapon you have in the beginning and the only damage I was able to do to the rats was 1 HP. Is it a bug or is it supposed to happen? I know that staff has 1d6 dmg.
Thank you in advance.

If memory serves, the rats only have 1 HP. I believe the damage report doesn't show more damage done than the critter actually has. As a test. try attacking a guard or something and see what happens.

They almost certainly only have 1HP. I just came across a room full with chickens and it was the same thing there. 1 HP for the lot, no matter which of us killed them.

No, they dont have 1 HP, they have 6-8 HP and it is annoying to wait for about 5 minutes to kill them all. But then when I bought bow, the damage dealt is suddenly correct with it, strange...