It is possible that RODBA was previously unlocked and the database moved to another server.  Unlocking RODBA creates a user-specified read-only SQL account which may not exist on the new server.  Locking the module and unlocking again should correctly re-configure the read-only SQL account.

1. Lock Read-Only Database Assistance (RODBA)
2. Unlock Read-Only Database Assistance (RODBA) 

It may also be necessary to adjust the REOpen7 DSN at workstations after unlocking RODBA.  The following article details the error typically seen and resolution should the DSN need to be adjusted:
Error: General ODBC Error: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified Native error:0 when clicking the Read-Only Database Assistance Query Tool link under Plug-Ins