[CentOS] Kickstart hang trying to install CentOS 5.3

I've been using kickstart successfully with a local mirror going back  
to CentOS 4.X.  I'm trying to install CentOS 5.3 via kickstart on a  
new system (which happens to be different than most other systems  
I've installed on), and the install process always hangs shortly  
after the partitions are created.  If I go to the alternate console  
#3, the last two lines are always this (except that the time stamp  
changes every time I try it of course):

   10:06:18 DEBUG:  Member xorg-x11-drv-i128-1.2.0-4 - u
   10:06:18 DEBUG:  Adding Package xorg-x11-drv-i128-1.2.0-4.i386 in  
mode u

This is preceded by hundreds of similar lines for other packages, but  
it always hangs at xorg-x11-drv-i128-1.2.0-4.  I am currently out of  
other systems to test/install this on.  Instead of the usual  
ThinkCentre mini tower, this system is a ThinkCentre pizza box.  I've  
installed CentOS on this type of hardware before without problems,  
but it hangs on the only two systems I currently have.

It's possible that there is something wrong with my local mirror, but  
I rsync it every night and this problem has been going on for a few  
days.  I will try to install this on a mini tower to rule out any  
hardware compatibility issues, but in the mean time, I'm looking for  
suggestions on how to debug this.  I've booted into Linux rescue mode  
after power cycling the system after it hung to look at whatever did  
get installed, but there are no useful log files.

Alfred