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Recently a couple of users have reported receiving Error message 506 Cannot Lock... just after logging onto their clients. As of yet only a couple of PCs seem to have been encountering the issue; however, all PCs on the network have been configured using the same settings as they were upgraded from Atrex v 14.02 to 14.31 at the same time.
The error mentions only one of the 3 connection IDs created on the server at login (one which notes the version of Atrex and DATA). FYI the Database Server shows version 15.0. via the Help>About.