If you are using Autoptomize for your site, then you will need to exclude WPVR from Autoptimize.
Then check if your tour is loading.
If this does not work or if you need the feature of Autoptimize for your site, then move on to Step 2.
Here, copy and paste the following:
wp-content/plugins/wpvr/public/lib/pannellum/src/js/pannellum.js?ver=1, wp-content/plugins/wpvr/public/lib/pannellum/src/js/libpannellum.js?ver=1, wp-content/plugins/wpvr/public/js/video.js?ver=1, wp-content/plugins/wpvr/public/lib/pannellum/src/js/videojs-pannellum-plugin.js?ver=1, wp-content/plugins/wpvr/public/js/owl.carousel.js?ver=5.2.4, wp-content/plugins/wpvr/public/js/wpvr-public.js?ver=1.0.0
Next, go to Autoptimize and under CSS Settings, find the ‘Exclude CSS from Autoptimize‘ field.
https://use.fontawesome.com/releases/v5.7.2/css/all.css?ver=1.0.0, wp-content/plugins/wpvr/public/lib/pannellum/src/css/pannellum.css?ver=1, wp-content/plugins/wpvr/public/lib/pannellum/src/css/video-js.css?ver=1, wp-content/plugins/wpvr/public/css/owl.carousel.css?ver=1.0.0, wp-content/plugins/wpvr/public/css/wpvr-public.css?ver=1.0.0
Now check. Your WPVR tours should work just fine.