Can't change rsvg images in gnome-theme-manager

[Rod Butcher <rbutcher hyenainternet com>]

Greetings. I have compiled gnome 2.16 from source. Everything appears to
work except I can't switch themes for the large icons on the panel -
such as the main menu and volume control. Other components of the theme
such as the frame border, colours, button shapes and small icons (on the
toolbar of applications) do get switched with the theme. Just the panel
icons don't. I understand these are in rsvg format, correct ? I have
built with the appropriate configure options for rsvg, and have built
librsvg, cairo, libgsf.
Any suggestions how I can debug this ?
thanks
Rod