Slideshow has no contents

The latest version of webkit (1.1.22) causes the slideshow to break, as mentioned in the bug report description. A security check in Webkit's XMLHttpRequest is failing:
** Message: console message: @1: Refused to get unsafe header "X-JSON"

Something is making Webkit think that the request is coming from a different origin.

This bug was fixed in the package ubiquity - 2.1.32

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ubiquity (2.1.32) lucid; urgency=low

  [ Didier Roche ]
  * scripts/install.py:
   - copy the cached wallpaper created either by g-s-d or nautilus or by the
     dedicated script in install mode. (LP: #530024)

  [ Evan Dandrea ]
  * WebKit puts file URLs in their own domain by default. This means that
    anything which checks for the same origin, such as creating an
    XMLHttpRequest, will fail unless this is disabled (LP: #532502).
  * Restore Colin's set_locale function. However, this is only half the
    puzzle. We need to finish running the language component when the
    exit button is pressed when in greeter mode.

  [ Colin Watson ]
  * KDE frontend:
    - Fix references to PARTITION_* in PartMan module (LP: #528171).
    - Drop real UID/GID when initialising KApplication. The real and
      effective IDs need to match, but raising them means we can't talk to
      D-Bus. Instead, use saved IDs to store our root privileges so that we
      can get them back (LP: #526486).
  * ubiquity-dm: Close stdout from dbus-launch.
  * Automatic update of included source packages: apt-setup 1:0.42ubuntu3,
    user-setup 1.28ubuntu4.
 -- Colin Watson <email address hidden> Sat, 06 Mar 2010 00:09:55 +0000