Is it certain that that fight between Xzar and Jaheira/Khalid is related to DSotSC ? In my game after I had installed DSotSC I had this confrontation - but through chapter 5 I didn't notice a single difference (npcs, items, quests) to a regular BG I game, so I decided that DSotSC, at least my installation of it, was not working properly and gave up on that game ...
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So long !
R³ - proud to be the official spokesman for the most noble Lady Bilqis, Desert Rose of Ironworks
Btw, the cow is queuing in the slaughterhouse right now !