InkChecker could not get ppd

[R.L. Grigg]

This morning, one of our systems can no longer print to any of our  
printers. Even doing a "preview" results in an alert panel saying  
"Error while printing". Some printers are remote, some local USB,  
etc. Whatever this is, its munged all printing for this system only.

Console.log:
   TextEdit[657] InkChecker could not get ppd for PSC_2350_series
   TextEdit[657] PMSessionValidatePrintSettings failed (error code =  
-50)
   TextEdit[657] Invalid PMPrintSettings in print info
   No such file or directory

I tried reinstalling the drivers for the various printers, but it  
made no difference.
I did a disk permission repair and a fsck on the boot drive, but no  
dice.
What could be wrong?

Power Mac 2xG5 2GHz OSX 10.4.10
Russ