What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
It appears that you have already reverted to Form Builder V3. You can also change this option on your end at any time by going to Account > Settings > then checking the form builder version you want to use.
Can you please provide us with information on how the form builder crashed? It would help us if you can give us some steps on how to replicate the issue where the form builder crashed. That way, we can send a report to our developers so this issue can be fixed.
Please let us know if you need further assistance.