re: huge error messages; 5,000+ pages

On V3R1: 

After working without hitch for  several years, we are suddenly  
getting 5,000+ page error reports from one department. 

The machines involved are PCs, two with Win 3.1 and one with Win95.  
The errors all seem to occur the same way: The PC locks up for no 
apparent reason and requires a hard boot to restart.  The 
AS/400 session just continues on until the next IPL or until the 
session is ended with a WRKACTJOB command.  Inspection of 
the error logs all point to the same kind of error; 

----------------------
  Message . . . . :   Permanent    I/O error occurred (C G S D F).
      Cause . . . . .   :   The RPG program 
TRNA2M in  library INQ2 at statement 126200  detected a permanent 
(not  recoverable) file, session, or   device error.  The   session,  
 device and/or program has been  stopped.
 ------------------------

The statement number (126200 in this example) always points to an 
EXFMT or WRITE of a screen format. 

The only thing that we've done recently that affects all of these 
machines the same is that the AS/400 library itself was totally 
redone to be Y2K compliant.  My first feeling was that I really 
messed up on a program, but it's not one program, and in fact some of 
the programs involved are Pro-Gen programs.  

Anyone have any ideas?
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