Here's what worked for me...
The font corruption problem continued to spread to other apps so I
started from the the OSX 10.4 DVD's and ran the disk ulility app on the
startup drive. I had it repair permissions, and scan & repair the drive
itself (there were some minor errors).
When that was done, I rebooted and ran software update for the most
current OS (10.4.9). After it installed and rebooted, everything was
back to normal.
Still don't know what caused the corruption, but at least it's history
for now.
Joe
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