Try getting everyone out of the programs, then use Windows Explorer to browse to the data directory. Find the file EZSEMTAB.xxx (where xxx is your data extension) and delete or rename this file. It's purpose is to keep track of which user is performing which function, and if someone's workstation had a system failure, it may not have been cleaned up successfully. Opening any Adagio program will recreate this file for you.
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Regards,
Softrak Tech Support