We have a number of identical desktops running SLED 11 SP2. They have been reliable. However, on Monday night we did a zypper update (from an SMS server that has a test and production environment) and the packages below were updated on production. Since that update we have had 5 or 6 instances of production desktops freezing. The mouse and keyboard stop responding. The computers do not respond to ping. The only solution is to turn off and reboot. /var/log/messages does not give any clues.

Are any of these packages likely culprits? (I expected a kernel update or something...)
What is the best way to back out updates?

-----------------------------------------------------------------------------------
The following packages are going to be upgraded:
bridge-utils flash-player google-chrome-stable kpartx libblkid1 libgudev-1_0-0
libpcap0 libreoffice libreoffice-base libreoffice-base-extensions libreoffice-b
randing-SLED libreoffice-calc libreoffice-calc-extensions libreoffice-draw libre
office-draw-extensions libreoffice-filters-optional libreoffice-help-en-US libre
office-icon-themes libreoffice-impress libreoffice-impress-extensions libreoffic
e-kde4 libreoffice-mailmerge libreoffice-math libreoffice-pyuno libreoffice-writ
er libreoffice-writer-extensions libudev0 libuuid-devel libuuid1 multipath-tools
popt rpm udev util-linux util-linux-lang uuid-runtime yast2 yast2-nfs-client