By a lack of a forum I know that covers the S.T.A.L.K.E.R. games I'll post this here:

I'm replaying S.T.A.L.K.E.R. Shadow of Chernobyl and I installed STALKER Complete 2009 to cover up most of the bugs and open up some good content. Now I started encountering the fact that Bandits and Mercs are allied instead of being hostile as they usually are. (I joined freedom for time so I don't know if that has something to do with it?)

Maybe someone who could help?

Don't use Complete!