Check your web server's error log. If that doesn't turn anything up, enabled Debugging in Moodle (you'll need to do it in the config.php file), reproduce the problem and check the error log again.
Just an aside - we don't recommend "one click installers" like Bitnami. They tend to set things up in weird ways that we don't know about and can be vey tricky to provide support for. It might be worth asking whoever provided Bitnami for you.
Just an aside - we don't recommend "one click installers" like Bitnami. They tend to set things up in weird ways that we don't know about and can be vey tricky to provide support for. It might be worth asking whoever provided Bitnami for you.