I was able to upgrade a 3 node cluster from 5.2 GA to this package. Cluster remained quorate, one one at a time was upgraded and re-joined the cluster.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.
http://rhn.redhat.com/errata/RHBA-2009-1166.html