Several users started complaining today about various X apps, such as 
xterm and emacs, that no longer look the way they want.  It looks like 
the resources they set in their .Xresources files are no longer set.

In ~/.xsession-errors I find the following:
sh: -c: line 0: unexpected EOF while looking for matching `"'
sh: -c: line 1: syntax error: unexpected end of file
sh: -c: line 0: unexpected EOF while looking for matching `"'
sh: -c: line 1: syntax error: unexpected end of file

The following is suspicious:
% xrdb -merge .Xresources
sh: -c: line 0: unexpected EOF while looking for matching `"'
sh: -c: line 1: syntax error: unexpected end of file

Note that the .Xresources file is fine and hasn't been changed in 3 years.

Then there is this:
% ls -l /usr/bin/xrdb
-rwxr-xr-x 1 root root 25064 Apr 12 06:40 /usr/bin/xrdb*

% rpm -q --whatprovides /usr/bin/xrdb
xorg-x11-server-utils-7.1-5.el5_6.1.x86_64

I think this package is broken.