Clients unable to print properly after upgrade to R6

R6.0.1CF1 on V5R1 AS/400 server.  Seeing a significant number of clients 
losing their ability to print properly after being upgraded From R5.0.X to 
R6.0.1.  Seen on HP Laserjet 8100, HP 693C, Lexmark OPTRAN, and other 
versions of Lexmark.  Newer versions of printers that have the ability to 
sense print type coming in and are able automatically  to switch back in 
forth between Postscript and PCL and thus are not giving clients any 
problems.  Older printers (I don't mean ancient) models are having to have 
their drivers switched to PCL to print properly but this is not a good 
enterprise solution.  Many locations have custom applications that require 
Postscript so their printers cannot be changed to PCL just for Notes 
printing   In R5 we did not see this problem but in our initial R6 rollout 
we are experiencing this issue frequently among bureaus.  Obviously the 
printer manufactures are stating it's not their problem and to purchase 
many new printers is not an acceptable answer.  Does anyone know what may 
have changed in the R6 design to cause this effect?  Any work arounds or 
directions?  Thanks.
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Gary L Wade
Lotus Notes Administrator
City of Orlando - City Hall
400 S. Orange Ave.
PO Box 4990
Orlando, FL 32802-4990
(PH) 407.246.3796  (Fax) 407.246.2878
Gary.Wade@xxxxxxxxxxxxxxxxx