https://bugs.winehq.org/show_bug.cgi?id=52779 --- Comment #7 from Lorenzo Ferrillo <lorenzofer(a)live.it> --- Actually part of my analysis was wrong. It's not that init_window_call_params is returing false, it's actually completing. However it is the fact that is being called BEFORE WH_CALLWNDPROC hook. Maybe the hook procedure change/initialize some stuffs, and it make some of the parameters invalid (or were never valid to begin with) In fact by adding some traces steps. It works until call_hooks( WH_CALLWNDPROC, HC_ACTION, same_thread, (LPARAM)&cwp, unicode ); But rise an exception in: dispatch_win_proc_params( params, sizeof(*params) + size ); the trace after is never printed. Moving init_window_call_paramsafter call_hooks( WH_CALLWNDPROC seems to solve this exception -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.