CA Managing system problem

It seems that some of out PC's after trying to connect to a V4R2 system to
upgrade to V3R1M3 of CA/400 then can no longer connect to network drives.  All
host servers on the 400's are fine, but Check Service Pack gives an error that
the PC cannot connect (even before giving a sign on screen), map network drive
fails, as does trying to open File Systems in the AS/400 Operations Navigator.
Can't even connect back to a V3R7 400 as the managing system or as network 
drive.

All other functions seem to work - PC5250, verify connection, cwbping, etc.

Haven't done enough research to determine the pattern.

Had one PC (TCP/IP, Win95) that this happened on - I downloaded & installed
latest V3R1M2 Service Pack, and it still happened.    I had to uninstall CA &
install from the V3R1M3 CD (even upgrading to V3R1M3 from the CD didn't work).

Has anyone else had this problem?

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