I have seen this problem three times now with Ubuntu 11.04, and the
uptime was 24 days plus an unknown number of hours each time.  The last
time it happened, I was actually at the computer at the time, and the
uptime was 24 days, 21 hours, and 5 minutes when I noticed the messed-up
launcher.  (I was writing an email and probably noticed within 15
minutes or so.)

The description in #20 sounds awfully much like some kind of signed tick
counter overflowing into its negative range, with some other code not
handling that properly until the counter gets into the positive range
again.  A signed 32-bit millisecond counter goes into negative territory
after 2147483648 ms which is 24 days, 20 hours, and 31 minutes.  This is
close enough to my latest uptime observation that I suspect it's not a
coincidence...

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https://bugs.launchpad.net/bugs/806248

Title:
  Launcher icons are all rendered up in top left corner

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