Marco:

I have more information for you.

The problem occurs after I restart my computer and run Delphi. If I try to access any form or data module with DOA components, Delphi stops with the message: "Codegear Radstudio for Windows has stopped working".

Restarting Delphi makes no difference. However, dropping a new TOracleSession component on any form stops the problem from occurring.

Once this has been done, I can work normally. The problem does not occur again until the computer is rebooted. So exiting Delphi and restarting is not a problem.

Thanks, Sidney