I've just got the BG2:EE and added some mods for a new runthrough, but I've found quite an annoying bug now.
Every companion starts at Lvl 0 (I don't remember which mod does that, but it was intentional). Jaheira and Imoen and my Main Char work just fine. However, Minsc (and since then Yoshimo, Aerie, Kivan and Dace) get unlimited XP. I can level them straight up to the maximum. To stop that, I have to manually edit their XPs via EEKeeper - and I have to do that every time they level up, as the bug comes back, which is kind of annoying.
Additionally I've just found out, that those companions cannot die. My Main Char and Jaheira can, everyone else just stays at 1HP and fights on.
Did anyone experience someting similar and can help me?