I am using balazan theme in Ubuntu 10.04 Lucid Lynx Alpha 4 from breathe ppa for Karmic Koala since Lucid PPA was not available when I started using Lucid. I saw this message when I launched gedit from terminal (gnome-terminal):
/usr/share/themes/balanzan/gtk-2.0/gtkrc:89: Murrine configuration option "scrollbar_color" is no longer supported and will be ignored. /usr/share/themes/balanzan/gtk-2.0/gtkrc:93: Murrine configuration option "gradients" is no longer supported and will be ignored.
Seems like the theme I’m using has some depreciated configuration options after Murrine update. I opened the /usr/share/themes/balanzan/gtk-2.0/gtkrc file (as root) using the following command from Alt+F2
gksu gedit /usr/share/themes/balanzan/gtk-2.0/gtkrc
and then removed the lines in question (89 and 93 in my case, those that contain depreciated options) and saved it. The messages are gone.
Hope this helps.