When accessing the FOS Login Window if a user receives an error: Requested record is locked (error=84) comment: btrieve_status (Thread5392) (Thread 0)
Solution:
Access the Pervasive Control Center from the FOS Server and clear all Pervasive connections.
Select the server in the next window.
First, try clearing the specific user session from the 'MicroKernel Sessions' tab.
Right click on the session and select 'Delete SQL session' to clear that session, and any others. It's best to delete the associated session for that user within that section. Just deleting one may cause other errors as well.
If problem persists, you can also delete all sessions found in the 'SQL Active Sessions' tab.