Check under HKEY_LOCAL_MACHINE\SOFTWARE\Pervasive Software\Communications Requester\Version 9\Settings for SatEntry values between a working workstation and the non-working one.  You could either correct the non-working one if different or just delete the "SatEntryx" settings.  If you delete them go ahead and set the "NumSatEntries" = 0.  Either way be sure no database client applications are running when you make the changes as the requester components have a tendency to cache the values.