Edit History

it's not a joke for those who do not know about such "issues",

see this thread maybe it helps: 

more specifically:

Quote

Prestashop uses unpkg .com as a CDN for the back-office template assets. The CDN is currently down, as you can see https://www.unpkg.com/status/ . It should come back up soon, I guess they are working on it.
I disabled the new theme, since the old theme has all the files hosted on the server and is not affected by unpkg CDN issues. Once it is back we can use the new theme again.