Topic: Updated MySQL data not showing up

This has to be a newbie question so sorry in advance... anyway, I have a Rails app running in production mode that queries a MySQL database. When I update the data in the db (notably the updated_on field), the new date does not show up on the web page (even after I stop and restart Mongrel and Apache2.) On my development machine, all I have to do is refresh the page. What do I need to do on the production machine? I'm not using caching so far as I know - I didn't set it up explicitly (I didn't know about it anyway).