F11 - X forwarding display problem

[John]

Hi all,
I recently installed F11 Preview (from live CD) on 2 of my laptops and I 
cannot run X apps remotely from these machines anymore. I get a message 
like: "(gedit:4221): Gtk-WARNING **: cannot open display: 
localhost:10.0". That means that the app is running on the remote 
machine (there's a PID) but I can't get the display on the local 
machine. The F11 machines can successfully run remote X apps from any 
machine that's not running F11. I've been looking for a solution for 
several days and I'm getting desperate
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