Recently I upgraded Thingworx from 8.1.3 to 8.4 and Thingworx Navigate from 1.6.1 to 1.9.1 following official PTC guides. During upgrade I did not see any errors or failures but now the Navigate Landing Page has serious rendering issues s you can see from the attached screenshot
Are not correctly upgraded, ora there is a bug in the upgrade package
I solved the issues copying all files contained in folder <TOMCAT_HOME>\webapps\Thingworx\Runtime from Thingworx Navigate 1.9.1 clean installation to my upgraded navigate. You are facing same issue on clean 1.9.1 installation?