Thanks, I can't find any log for the Baldur.err, even tough my Baldur.lua file has the Debugmode option :
SetPrivateProfileString('Program Options','Debug Mode','1')
I went to create drizzt.cre in Brasamical and got the bug, though i couldn't determinate what causes it. It was not a spell or skill as far as i can tell. Turning the AI off and just defending let me avoid the bug it seems. But when attacking, I got the freeze at a random point (no switching of weapons, just plain attacks ; turning the AI off still got me the bug).