http://bugs.winehq.org/show_bug.cgi?id=35582
--- Comment #36 from Sarah wintertanz@gmail.com --- Seems to be working again in 1.7.16 trunk (at least since wine-1.7.16-133-gd8ca8c2). See http://us.battle.net/wow/en/forum/topic/11675557804?page=7#128
I can confirm this. Using unpatched wine 1.7.16 from trunk, the 64 bit client is not crashing anymore.