OS:	OS X Version 10.13.3 (Build 17D47)
wxWidgets:
wxWidgets Library (wxMac port)
Version 3.1.0 (Unicode: wchar_t, debug level: 1),
compiled at Feb 13 2018 20:05:03

Runtime version of toolkit used is 10.13.

GL_VENDOR:	Intel Inc.
GL_RENDERER:	Intel Iris Pro OpenGL Engine
GL_VERSION:	2.1 INTEL-10.30.14
TrenchBroom Version:	2.0.0
TrenchBroom Build:	v2.0.0-final Release
Reason:	Exception: Cannot undo individual commands of a command group
Stack trace: