Hi Plantje,
You should have two entries in the logging area.
One for the file logging (default)
One for the database logging.
I have done many Cognos installations including the Audit functionality.
Until now I knew all undocumented issues how to install the Audit functionality.
What can I check / do next?
Until now, Cognos / IBM only mails me the 'default' installation documentation, but that's what I done and know

There must be a way to check something I hope?