24x80 size issue

Quick question:

Had a model 600 - upgraded to a 170, all sysvals the same, OS/400 stayed at 5r1.

I have some thin clients that worked fine pre-upgrade, but now, post upgrade, I 
get an error concerning the "clients" ability to show fields/data outside of 
the 24x80 workspace.  Extended display error.  The third party vendor tells me 
they haven't seen this in  a LONG time (not since some VERY old terminals were 
in use) and that all newer terminals should be able to handle the way things 
are NOW.  

Our existing dumb terminals (3477FGs over twin-ax) handle everything just fine, 
as do our CE sessions.  I'm stumped b/c the thin clients DID work just fine 
before the change in AS400s and I am too much of a novice to be able to tell 
what is happening.  I have manually created devices to see if that is the 
problem - no.  Autocreate - no.  


Secondly . . and I'm certain this is tied into the same issue, deals with 
printing.  I setup a session on the thin clients for printing, manually create 
the printer (with model type, etc) and everything was working great.  We 
changed systems and now I get what looks like about four lines of ascii column 
and row "headers" boxing in the correct printout.  The thin client setup did 
not change . .and I am stumped.

Any ideas?

Thanks!

Anthony Hardy
Director of MIS