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Can you please tell us the URL of your form affected by this issue? Also which browser you were using during that time.
So far I could not reproduce the same when using the new Form Builder v4.
I will investigate further once I know more details base on your description.
I am using Windows Explorer at this time, but was working on another form
I checked of few version of Internet Explorer and was unable to reproduce the freezing issue on my end either. May I ask what version of IE you are using and which form you are editing? We are trying to get every bug we can for v4 so if we can reproduce this on our end, it would be most helpful.