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Is this the jotform http://www.jotform.me/form/42614486981464 ?
Was it embedded on a website? Can you share to us the URL of the website if it was-- we will check the form there.
I already test by refreshing the browser where the jotform http://www.jotform.me/form/42614486981464 was, but so far I did not encounter the fields getting locked as you mentioned.
I am not sure though if I was doing the test correctly. You should also describe to us the steps how to reproduce the problem. On my end I used the browser Refresh button to reload the jotform.
But so far after so many attempts, I could not reproduce the problem.
Please inform us if issue remains.