Comment 9 for bug 1071354

>please could you check whether the crash is still there on either platform?

r12011 works ok with GTK2 and GTK3 builds (no more crashes) on OS X 10.7.4, with either backend of GTK+:
- GTK+/X11 2.24.13, gtkmm 2.24.2, glib 2.32.4
- GTK+/X11 3.4.4, gtkmm 3.4.0, glib 2.32.4
- GTK+/Quartz 2.24.15 (git branch), gtkmm 2.24.2, glib 2.34.3
- GTK+/Quartz 3.6.4, gtkmm 3.6.0, glib 2.34.3

I do get some warnings when compiling (with llvm-gcc.4.2), both with GTK2 and GTK3, but they don't cause the build to fail. From the GTK+/Quartz 3.6.4 build:
../../src/ui/widget/gimpcolorwheel.c: In function ‘set_cross_grab’:
../../src/ui/widget/gimpcolorwheel.c:690: warning: ‘gdk_pointer_grab’ is deprecated (declared at /Volumes/cyan/mp-quartz/with-a-long-long-long-directory-name/include/gtk-3.0/gdk/gdkmain.h:86)
../../src/ui/widget/gimpcolorwheel.c: In function ‘gimp_color_wheel_grab_broken’:
../../src/ui/widget/gimpcolorwheel.c:704: warning: unused parameter ‘event’
../../src/ui/widget/gimpcolorwheel.c: In function ‘gimp_color_wheel_button_release’:
../../src/ui/widget/gimpcolorwheel.c:800: warning: ‘gdk_display_pointer_ungrab’ is deprecated (declared at /Volumes/cyan/mp-quartz/with-a-long-long-long-directory-name/include/gtk-3.0/gdk/gdkdisplay.h:56)
../../src/ui/widget/gimpcolorwheel.c: At top level:
../../src/ui/widget/gimpcolorwheel.c:106: warning: ‘gimp_color_wheel_size_request’ declared ‘static’ but never defined