It's pretty much the same crash. Presumably once you uninstalled Mono, you uninstalled Control:Mac, restarted, then reinstalled Control:Mac?

I'm very new to macs but I thought that mine (came with Lion) had X11 as part of the standard OS install. I also don't think it's anything to do with the problem so personally would not touch that.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).