Running a domU with FC4 release 1268?

["Jeffrey Buell" <jbuell vmware com>]

With release 1240 I was able to follow pretty closely the QuickStart guide
and get a domU running.  Now with release 1268 I follow the same procedure
and get dom0 up, but 'xm create -c base' immediately crashes with the message

unable to handle kernel paging request at virtual address 8b04ec93

Any ideas what may be wrong?  Has anybody else used Xen with release 1268?

Thanks,

Jeff