I moved my production site to a development server to upgrade and make some changes.
When I go to login the screen just loads but does not redirect to control panel. I have checked the sessions table in the DB and a new session is being created.
If I close the tab and reopen the login URL I get a white screen but the loader keeps spinning. If I clear cache and cookies and access the login the page loads.
I have added and changed the values for these variables
$config['cookie_domain'] = '';
$config['cookie_path'] = '';
$config['cookie_prefix'] = '';