-I am trying to upgrade from Rabbitmq 3.8.5 + Erlang 23.0.2 to Rabbitmq 3.9.8 + Erlang 24.1.4 and experience similar issue right after upgrade.
-Before uninstallation, I have manually shut down the service ,then un-installed both Rabbitmq 3.8.5 and Erland 23.0.2 completely, even went through my registry to make sure there are no left over. Then rebooted my server and deleted both folders.
-After that, I install both new version or Erlang and RabbitMq and updated my environment variables to point to the new folder.
-To my surprise, when i login to this new environment, the default user name and password "guest" and "guest" doesn't work. However, I can use the user name and password from the old system. Upton logging in, I noticed that my previous defined vhost are still displayed. Obviously, there were left over information that i don't expect and I will like to find out there are those information stored at.
-Anyway, i did test out rabbitmqadmin using "rabbitmqadmin list exchange" and I did get the exchange information return in the command line windows so I suppose the issue is Management UI not rendering properly. Include are screens shot for the old GUI "currently still running production" server vs the new "test server with new version" GUI
Above is the new version and below is the old version