Form freezes in v4 builder when I delete an element

I'm building a new form this morning using the new system and every time I delete an item from the form the form freezes.  Refreshing the page fixes the issue.  The problem has occurred in IE 11 and Chrome.

Clearing the cache and history didn't fix the issue.

Hi, thank you for contacting us.

As you have probably seen, I have just collaborated with you on the form and created a header element, with the text being aidan testing...etc, then previewed it, and then removed it without having the form freeze on me.

Could you please try on another machine/device to see if the problem persists?

Thank you in advance. We'll be looking forward to your reply so that we can assist you further.