[Centos] Error when updating centos-3.3 to 3.4

[schaefer+centos at zanshin.com (Bart Schaefer)]

The following error appeared and I'm wondering if it's important enough to 
file a bug report:

/var/tmp/rpm-tmp.8817: line 2: gdk-pixbuf-query-loaders: command not found
error: %postun(librsvg2-2.2.3-2) scriptlet failed, exit status 127


Also /etc/sysconfig/rhn/rhn-applet.rpmnew got created; the difference is 
that the uuid has changed from a hex key to "UNSPECIFIED".  I don't recall
where that hex key came from -- was it in a previous CentOS release, or 
could it have come from an RHN signup at some other time?