All portal pages showing as blank.Issue When opening any portal page nothing was being rendered, with the user being confronted with a completely blank page.CauseLooking at the session debug log showed the following error occurring: SPWidget:SCSS portalId is null (id: v8f56ad92db9a76005dd9728dae961947 portalId: null): no thrown error SPScriptable called without x-portal in request header This was not displaying in another instance running on the exact same release build, but where the behaviour did not occur.ResolutionIt was identified that the "glide.ui.escape_all_script" System Property had been set to 'false' in the affected instance, whilst it was set to 'true' in the instance that was functioning as expected. This was, therefore, causing escaping issues. As per the 'General Security Settings' documentation (https://docs.servicenow.com/bundle/rome-platform-administration/page/administer/security/reference/r_GeneralSecuritySettings.html ) the recommendation is set this System Property to 'true'.