Please help me. As soon as I add my cdn url of cloudfront, I see a broken site. And no change after waiting for hours. I do not see any issue from Cloudfront. Same url was working fine with wordpress weeks back. Note that I'm not using S3.

screenshot:

I experienced the same but luckily saw out what went wrong: It's not enough to put only the CDN domain in the 'Custom URL' field, but you need to specify the whole path where the uploads are located! See screenshot below. As soon as I changed that and cleared the cache, everything works perfectly!

BTW, I'm using KeyCDN (which I highly recommend for their great pricing and as far as I know they're the only one that don't change extra for a custom url like cdn.yourdomain.com) and not Cloudfront, but I think the issue here is the same.