FWIW, I finally got this working for him. It turned out to be a few things:
1) The users were not "enabled" in the Applications (they existed in GComm, but not both the gforum and glinks databases =))
2) There were some odd users, that were from a Links 2 into GLinks import (the usernames were too long, and also had @ signs in - so were invalid)
3) The passwords seemed to change when creating in GComm - so each user has now gotta do a password reminder, to get their password sent, so they can change it to what they want.
To anyone reading this - you won't have these problems if you setup GLinks + GForum + GComm together to start with - just something worth considering <G>
Want to give me something back for my help? Please see my Amazon Wish List
GLinks ULTRA Package (plugins total "value" $3,325 & rising, for just $350)| GLinks ULTRA Package PRO (plugins total "value" $5,625 & rising, for just $500)
Support Forum | Links SQL Plugins | DMOZ Dumps | UltraNerds | ULTRAGLobals Plugin | Pre-Made Template Sets | FREE GLinks Plugins!
Compare our different Plugin packages *new* Free CSS Templates