I have created my Facebook app and got ID and secret key. I have then configured HybridAuth index file with every possible variations in base url and other parameters. Unfortunately, to no avail. It's not working. If you want to take a look: http://www.mindfulnessbergamo.net/codoforum/index.php?u=/user/register. Any hint? Thanks.

Can you check if you get any php errors in your server error log ?

Unfortunately I am on a shared hosting and my provider will not give me any server error log.

Can you give us ftp access to your server ?