The update to Glibc for RedHat 6.2 (glibc-2.1.3-21) does not know about the system type of Nautilus. This worked with the original glibc package shipped with 6.2 (2.1.3-16) however the 'updated' package fails. This effects X-Windows and clock (to name a few)., and forces the user to: ln -s Tsunami /etc/alpha_systype
Should be fixed in glibc-2.1.3-22 errata released yesterday.
after upgrading to 2.1.3-22, xscreensavers (not GL) have become very jerky. They pause ever so frequent, 3 times per second or thereabouts.