module_invoke_all('user', 'login', null, $user); not logging user in

Hi there,

I'm developing a site which uses SSO and the CAS module and have some login problems.

The login works correctly up until the point where cas_login_page() is called. The User ID is set correctly and everything is fine. However, after tha call to drupal_goto() in cas_login_page() to redirect to the right page the user session information is lost ($user->uid isn't there any more).

Commenting out the call to cas_login_page() makes the login work (page displays "Logged in via CAS as username") but why is this failing normally?

It seems the user session isn't getting stored correctly.

Ben