Of course this is easier if you have access to your server… If you’re in a hosting situation, I know some web hosts may not allow their servers direct internet access, or may have changed their policies which would mean embedding breaks. I guess a support call to your hosting provider is your only option in this instance. ??
This fixed my problem. I have a two wordpress accounts each hosted by two different servers. One server just would not work, and then I tried the other after reading your post and it worked instantly.
My guess is that most of everyone’s issues are probably server side. Hopefully Paul sees your post and mine.