I have conclusively traced this down.  It starts happening as soon as
the automounter times out (typically 10 minutes of inactivity) and
unmounts my home directory (accessed over NFS v3).  I have no idea what
changed in 8.04 to cause this symptom, as I've been using an NFS home
directory for over ten years with perhaps a dozen or more Linux
distributions and NEVER saw it.

The remote directory is exported using "no_root_squash", which means
that root processes can (and do) trigger the mounter and are able to
apply their expected permssions on the far end.  I can only suspect that
the xorg folks changed something or tightened something up with regard
to how the X server accesses ~/.Xauthority.

Whenever this occurs, all I have to do is go to an xterm (or the console
if none is open) and do 'ls'.  That triggers the mount again and X
permission work correctly - until the next time.  Very annoying and I
hope it's corrected soon.

-- 
Warning: Unable to open display ':0' and cannot connect to X server :0
https://bugs.launchpad.net/bugs/250712
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