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I currently could not reproduce this issue yet. But I can see that your form http://www.jotform.com/40080539293151 is completely blank when viewed on browser on my end.
BUT again, your other 2 forms are fine also
I am not sure if the changes you did causes the form to become entirely blank.
And unfortunatelly, if the form is saved. That latest saved version will be the remaining version. There is no means to roll-back or revert to a previous saved version.
The most I can suggest at this time is to re-create the form from start.. hopefully you can just clone and existing form so that it will be easier to rebuild the form version.
Hope this help. Please inform us if there is more we can help you with.