It seems that your quick shutdown just "damaged" some of X's font directories. I'd suggest trying to run XFS's fsck-like tool to fix any errors on your disk, and then re-installing the X fonts, or the X Server. If that doesn't work, try un-installing evrything X, (backup/move your config files for later reference), and re-installing everything; it shouldn't takle too long. Re-installing Redhat is going a bit too far, as this seems limited to a single part of your system.
Anyone else have any other ideas? I'm not yes too experienced in X.