Hi Jacek, why do you have tls_list in http://www.winehq.org/pipermail/wine-patches/2009-May/072833.html ? The usual idiom is to just free each thread's data in THREAD_DETACH, isn't it? I ran into this while chasing a crash regression in Sketchup, see Anastasius' comments in http://bugs.winehq.org/show_bug.cgi?id=18601 - Dan