Oh. Wait. Wait. You've got Polish language in your installation settings. That's why I needed Weidu.log, thank you very much for providing it, it's a very important detail, now it's clear(otherwise I'd be left guessing)!
So. Bad news: BG2EE mods of mine, including Xan, work for BG2EE only in English currently.
I CAN make a working Polish install for Polish users, and with pleasure, but it would require different encoding, and since I do not speak the language(alas), I would need a person who speaks Polish language to recode my .tra Polish files for Xan(or any other mods of mine) in UTF-8(no BOM/byte-order mark). Currently it's in CP1250, which Does Not Work in BG2EE. Additional information is found here: http://forums.pocketplane.net/index.php/topic,28771.25.html
If you or any other guys or ladies at Polish community would like to do it for me and to send me the files, my e-mail is kulyok,
I am leaving for a New Year vacation Friday, though, and I'll be missing for about two weeks, so if not done quickly, it must wait until the end of the holidays.