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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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We do not have any downtime and none of our other user have reported this issue.
It seems you have created one another thread with similar issue: http://www.jotform.com/answers/453337-Form-problem-Jotform-Performance-Issue#2
I did check the screenshot you have shared. It seems be be a CDN related issue. I would suggest you to clear your browser cache and the click on the following URL to sign in to your JotForm account: http://www.jotform.com/?noCDN=true
Hope this helps.
Do get back to us if the issue persists.