https://bugs.winehq.org/show_bug.cgi?id=37614
--- Comment #14 from Ken Sharp imwellcushtymelike@gmail.com --- I have some pre-built versions of Wine installed back to 2.0.5 and I couldn't recreate the issue, so this may have been fixed outside of Wine.
I also tried 1.8.7 (and earlier) but it crashes out badly.
I also discovered that X11 has a window (client) limit - who knew?