If you’re on the discord, see a discussion here: Discord
The first step would be to try resetting both your caches. See How to clear your Cache
The asset Harry was having them test however is no longer valid, and I don’t know how often they may invalidate to give you a link to another to test.
But basically they found out that they had an extension installed that was forcing all connections to redirect to HTTPS when the asset is served on a HTTP asset server, so all assets would just time out for them as it hits the redirect limit.
Your situation may be different; but ultimately something is preventing you from receiving data from the CDN.