Hi,
I've discovered a small but potentially confusing remnant from when myUser extended sfFacebookUser.
In modules/sfFacebookConnectDemo/templates/indexSuccess.php, there still remain two lines where $sf_user->getCurrentFacebookUid() is called. However, since myUser no longer inherits from sfFacebookUser, these lines result in a PHP error and halts execution.
If you remove those two lines, the demo works great.
Thanks!
-Ben Arwin