Hi Paul
I didn't found any path like you suggested /Users/<username>/Library/Application Support/Autodesk/...
but I think, after macOs implemented sandboxing you where referring to the following one:
/Users/<username>/LibraryContainers/com.autodesk.mas.fusion360/Data/Library/Application Support/Autodesk/Autodesk Fusion 360/
BTW the file you specified: vx360.webcomponents.js vx360.webcomponents.css vx360.webcomponents.lib.js vx360.webcomponents.lib.css are located on my machine under the application bundle
/Applications/Fusion360.app/Contents/Libraries/Neutron/Neutron/Server/BatchRender/Resources/vx360.webcomponents/scripts/vx360.webcomponents.js
/Applications/Fusion360.app/Contents/Libraries/Neutron/Neutron/Server/BatchRender/Resources/vx360.webcomponents/scripts/vx360.webcomponents.lib.js
/Applications/Fusion360.app/Contents/Libraries/Neutron/Neutron/Server/BatchRender/Resources/vx360.webcomponents/css/vx360.webcomponents.css
/Applications/Fusion360.app/Contents/Libraries/Neutron/Neutron/Server/BatchRender/Resources/vx360.webcomponents/css/vx360.webcomponents.lib.css
I closed the application, I replaced the original file with the files you shared, I restarted the application but nothing changed: the problem is still there.
Did I miss something?
Thanks
Luca