Navigation page not loading after 5.5 upgrade
Might be a problem with the web.config file on the web server. Normally this happens when going from http to https. Contact support and they can send you the correct web.config file.
Our issue is resolved after getting a new config file from RSA with SSL and SSO in ON.
Also in IIS, we will have something called application pool, the .net framework version should be 4.0