This could be due to an index problem caused by a duplicate breath alcohol technician entry in the BATs database.  To see if this is the case, return to the @ Work main menu, and choose the Maintenance option. If you get an error message "Unable to reindex BATs database", this may likely be the cause. To resolve this situation, download fixbats200.exe, copy it to your C:program filesAlcoSensor IV @ Work directory, and run the program.  This is a utility that eliminates any duplicate records from the breath alcohol technicians database in @Work 2.X if they are present.