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[Ben Allen <751163@xxxxxxxxxxxxxxxxxx>]

I have been experiencing this same problem for several months now.  It always starts out as a sudden, dramatic increase in the amount of time that it takes to simulate the AI players moves after I click the "Turn Done" button (CPU is always pegged at 100% when this happens).  After that point, scrolling around the map or anything else that requires redrawing a significant portion of the screen lags terribly and will peg the CPU at 100% for brief periods of time.  Fairly soon after this happens, I see the same behavior that Phillip reported with the desktop suddenly reverting to a default theme and set of icons.  Running the following script usually brings all of the icons and widgets back to the normal theme:
  killall gnome-settings-daemon
  gnome-settings-daemon &
  killall nautilus
This is usually only temporary, and after 10-15 minutes I'll get dumped back to the default theme again.  Completely restarting the X server will usually prevent the problem from resurfacing for an hour or so, but it only delays the inevitable.

I have also had this problem occur while running nothing but Firefox,
but the vast majority of the time I see this problem is when I'm running
Freeciv.

I modified my script to save a copy of .xsession-errors when it tries to
restart gnome-settings-daemon.  I'll attach it to this ticket in case it
contains anything useful.  Is there anything else I can provide to help
debug this issue?

** Attachment added: ".xsession-errors log showing additional information"
   https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/751163/+attachment/2533960/+files/.xsession-errors.bak

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https://bugs.launchpad.net/bugs/751163

Title:
  gnome-settings-daemon crashes during use

Status in “gnome-settings-daemon” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: gnome-settings-daemon

  Sometimes while using the system, gnome-settings-daemon crashes with the following output:
  -----------------
  The program 'gnome-settings-daemon' received an X Window System error.
  This probably reflects a bug in the program.
  The error was 'BadMatch (invalid parameter attributes)'.
    (Details: serial 5066 error_code 8 request_code 15 minor_code 0)
    (Note to programmers: normally, X errors are reported asynchronously;
     that is, you will receive the error a while after causing it.
     To debug your program, run it with the --sync command line
     option to change this behavior. You can then get a meaningful
     backtrace from your debugger if you break on the gdk_x_error() function.)
  -----------------
  Ubuntu 10.10

  gnome-settings-daemon:
    Installed: 2.32.0-0ubuntu3.1
    Candidate: 2.32.0-0ubuntu3.1
    Version table:
   *** 2.32.0-0ubuntu3.1 0
          500 http://mt.archive.ubuntu.com/ubuntu/ maverick-updates/main i386 Packages
          100 /var/lib/dpkg/status
       2.32.0-0ubuntu2 0
          500 http://mt.archive.ubuntu.com/ubuntu/ maverick/main i386 Packages

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