Gnome/Network Proxy preference tool: Cannot add an entry in the Ignore Host List

[Sugarless]

I cannot add an entry in the Ignore Host List in the "Advanced Configuration" tabbed section of Gnome's Network Proxy preference tool any more.. There' s no entry at all. If I enter a specific host name and clicking "Add", the ignore llist remains empty (and the enter field is cleared.).

What are the underlying gconf or config files? (for checking permissions etc.)

Thank You.