This is a very annoying issue that does not create messages in the error logs, but just keeps looping as if there is an issue. Very sorry to hear that you are having this problem, it’s very frustrating!
Here’s how to fix it… It’s due to a mismatch in URL’s in two locations, the database and the wp-config file.
In the wp config file…
$table_prefix = 'wp_';
define( 'WP_SITEURL', 'http://www.domain.net' );
define( 'WP_CONTENT_URL', 'http://www.domain.net'/wp-content' );
define( 'WP_PLUGIN_URL', 'http://www.domain.net'/wp-content/plugins' );
define( 'WPMU_PLUGIN_URL', 'http://www.domain.net'/wp-content/mu-plugins' );
and also the database, specifically the options table in the “siteurl” and “home” variable.
Make sure the base URL, including the http or https, are all consistent across all these variables.
If it’s not that, send us a support ticket, we’d be curious to see what else it could be!