Rails - Jul 2006 - App crash but nothing in logs

Hello, I have a big problem with an application running in production 
mode : the app crashes but there''s nothing in the logs
Setup is Apache + FastCGI - I know there is something wrong with my code 
somewhere (crash is not related with the setup)

How can I do to have further informations about the error while staying 
in production mode ? Should I run an instance of the application in 
development mode but with Webrick instead of Apache ?

Thanks

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