I confirm this too.
As this button merely opens the "Login Window" preferences dialogue under the menu System->Administration, simply open it that way until it has been fixed. (gdmsetup is in fact the "Login Window" preferences dialogue)
I confirm this too.
As this button merely opens the "Login Window" preferences dialogue under the menu System- >Administration , simply open it that way until it has been fixed. (gdmsetup is in fact the "Login Window" preferences dialogue)