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.
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Just tried to create a new form and access the conditions and it works there...
Thank you for the additional update. I have checked your forms and I see that this form: http://www.jotform.me/form/52655575476468 is the only one that seems to not allow conditions wizard to be opened.
Now looking at the form, it seems that the issue is with the form itself, but I will update you here in few moments after confirming the same. If I am correct, then your form should be working properly for you after that.
Your form is working properly now. The issue was caused by the deleted fields that were still set to be used in your conditions, but I was able to remove the same from your form causing it to work properly now.
Do let us know however if you happen to experience any further issues and we would be happy to assist with them.