Comment # 21 on bug 1186341 from Martin Wilck

I'm using the GTK client, too. For you, it crashes without
XLIB_SKIP_ARGB_VISUALS=1, whereas I need to remove this to *avoid* it crashing.
Both of us are using latest TW, I suppose. I'm in a  GNOME/X11 environment with
a 3-monitor setup (no idea if that matters), otherwise everything is pretty
straightforward. Is there anything special in your environment?

At the same time, there seem to be others who aren't affected by the issue
either way. It's getting mysterious.