[SOLVED] gedit can't change font size as root

[errorxp]

I want to change gedit font size and color scheme as root but the font is locked out and when selecting a color scheme I get the following error:
** (gedit:2562): CRITICAL **: gedit_prefs_manager_set_string: assertion `gconf_client_key_is_writable ( gedit_prefs_manager->gconf_client, key, NULL)' failed
How can I get around this?

[sonoran]

It works if you become root in a terminal using su -, and then start gedit, but doesn't work using, for example, su -c 'gedit'. Note that using the su - method does not produce all the warning messages in the terminal, either. Something about gedit not being able to connect to the gconf configuration server.

[errorxp]

Thanks, su - allows me to change the settings.