Upgrading RHEL from 5.3 to 5.4

I was having all sorts of strange problems while upgrading my test box from RHEL5.3 to RHEL5.4.  I did a search, but it didn't seem to turn up much... just a link to an unrelated problem, and a Russian website.  Well, I don't know Russian but I was able to decipher a hint: "yum clean all".  That did the trick.  I think I'll run that prior to upgrading all my production boxes.  Here's the error I was getting:

# yum update libX11
Loaded plugins: rhnplugin, security
Skipping security plugin, no data
Setting up Update Process
Resolving Dependencies
Skipping security plugin, no data
--> Running transaction check
--> Processing Dependency: libX11 = 1.0.3-9.el5 for package: libX11-devel
---> Package libX11.i386 0:1.0.3-11.el5 set to be updated
--> Running transaction check
---> Package libX11-devel.i386 0:1.0.3-11.el5 set to be updated
--> Processing Dependency: /usr/share/X11/XKeysymDB for package: openmotif22
--> Processing Dependency: /usr/share/X11/XKeysymDB for package: openmotif
--> Finished Dependency Resolution
openmotif22-2.2.3-18.i386 from installed has depsolving problems
  --> Missing Dependency: /usr/share/X11/XKeysymDB is needed by package openmotif22-2.2.3-18.i386 (installed)
openmotif-2.3.1-2.el5.i386 from installed has depsolving problems
  --> Missing Dependency: /usr/share/X11/XKeysymDB is needed by package openmotif-2.3.1-2.el5.i386 (installed)
Error: Missing Dependency: /usr/share/X11/XKeysymDB is needed by package openmotif22-2.2.3-18.i386 (installed)
Error: Missing Dependency: /usr/share/X11/XKeysymDB is needed by package openmotif-2.3.1-2.el5.i386 (installed)
 You could try using --skip-broken to work around the problem
 You could try running: package-cleanup --problems
                        package-cleanup --dupes
                        rpm -Va --nofiles --nodigest