Im having a similar issue to this with the latest Beta, it happens when we paste in any youtube link, it just thinks.
Hello K,
Sorry I had to move your reply to a new topic. I just tried embedding a Youtube video using our Video module and it works just fine. Are you using the same module?
Ben
Hi Ben,
Yes, dragging the video module from the default options over then changing to embed and putting any random youtube link - ie https://www.youtube.com/watch?v=t6Urk7ZPPFo and then trying to save, it doesnt seem to take.
Hey K,
This may be caused by a 3rd party plugin conflict. Let’s have you go through the plugin deactivation route, i.e., disable all plugins and test the Beaver Builder while reactivating each to determine if the issue is related to a 3rd party plugin. Let us know how it goes!
Ben
Hi Ben,
There were no plugins at all, so thats what made it strange, but after some continous firewall blocking found it it was all caused by mod_security.
Adding the following to the .htacess fixed everything.
SecFilterEngine Off
SecFilterScanPOST Off
cheers!
Awesome! Glad it was that simple! 
Have fun with BB!
Ben