Comment 3 for bug 459117

What's the difference between the GDM in 9.04 and 9.10?

While grasping at straws and editing /usr/bin/startx, I noticed that it had:
    defaultdisplay=":0"
In my mostly working 9.04 ~/.bashrc, I had the line:
    export DISPLAY=localhost:0.0
Changing my broken 9.10 ~/.bashrc to:
    export DISPLAY=:0
and running:
    brianp@trex:/etc/X11$ xhost +
    access control disabled, clients can connect from any host
I can now run gvim. Why does one display work in 9.04 while breaking 9.10? Which one is correct? More correct? I have read accounts of people stating that this is a "really bad idea". Am I shooing myself in the foot here?

There must be a system tool for exactly this problem. I have been all over the only App->Sys tool which looks at all promising, the Configuration_Editor. Desktop -> Gnome -> Session looked interesting, but no sign of TCP, NOLISTEN GDM, KDM, ... Then, there is Apps -> GDM -> Simple-Greeter (the only item) -> settings-manager-plugins -> XSettings (!!!) This has to be it. No, just active and priority.

What am I missing here?

Thank you,
    BrianP