http://bugs.winehq.org/show_bug.cgi?id=35718
--- Comment #3 from Frédéric Delanoy frederic.delanoy@gmail.com --- (In reply to Ken Thomases from comment #2)
Please try attachment 47706 [details] from bug 35705 to see if it helps.
It doesn't help much: X doesn't crash now, but screen flickering is much increased, and startup is still stuck (at the flickering "Loading..." (full)screen).