Tautulli - Monitor your Plex Media Server

I have found that when I upgrade Tautulli and the upgrade is finished, the only way to get the application to run again is to reboot the PC. If I try to launch the other url again, it just gives me an error. I have checked the FAQ but I am sure I am doing something wrong. I really don’t want to make @SwiftPanda16 just point me to the FAQ I missed but I am bracing myself!