V4R5 new installation problem

[Rob Dixon <rob.dixon@xxxxxxxxxxx>]

I recently moved a complete operating environment from a V3R7 system to 
a V4R5 one.  Both are now on my network. 

If I use Ops Navigator in V4R5 for the new system, when I attempt to 
sign on, for many functions, V4R5 comes up with a new slightly enlarged 
Signon window which says -

"To access this resource,  you need to sign on to the AS/400 system"  
(which is what I am trying to do!)

It then says

"Resource:  Code page conversion table (285 to 437)"

Below this are the system name and fields for entering my user ID and 
Password, as in the standard Signon window.

However, the system name, which I cannot change, is that for my V3R7 
system, not the V4R5 system to which I am trying to sign on..

Does anyone know  why there might be a need for code conversion and why 
it wants to go to my old system?

If I have set up Ops Navigator correctly, why should an attempt to sign 
on to one system prompt me to sign on to the other?

I am not sure whether it is relevant but Ops Navigator was set up with 
my  V3R7 system as the Central system.  I have changed it to the V4R5 
system but the problem persists.   I also deleted the V4R5 connection 
and recreated it.

Any help gratefully received!

Many thanks

Rob Dixon