This is fixed in the current development release (with Xfce 4.8, thunar-vfs is deprecated and thnar and xfdesktop4 moved to gio), but won't be backported to the previous ones (too many changes, especially in ubuntu 10.04 which only has xfce 4.6), sorry.
This is fixed in the current development release (with Xfce 4.8, thunar-vfs is deprecated and thnar and xfdesktop4 moved to gio), but won't be backported to the previous ones (too many changes, especially in ubuntu 10.04 which only has xfce 4.6), sorry.