possibly upstream bug in the ClearLooks theme engine or in GTK+/Quartz?
Could you test this:
1) open terminal and create an empty '~/.gtkrc-2.0' file with
$ touch ~/.gtkrc-2.0
(if the file already exists - temporarily rename it and then create the empty one)
2) launch Inkscape.app -> it should now use the default (fallback) gtk theme.
Do you still have missing radio buttons?
possibly upstream bug in the ClearLooks theme engine or in GTK+/Quartz?
Could you test this:
1) open terminal and create an empty '~/.gtkrc-2.0' file with
$ touch ~/.gtkrc-2.0
(if the file already exists - temporarily rename it and then create the empty one)
2) launch Inkscape.app -> it should now use the default (fallback) gtk theme.
Do you still have missing radio buttons?