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I presume this is the form http://www.jotform.us/form/21794400760148 in question. (please correct if not)
I checked the form and see that it has condition rules like this for the scale rating fields
when I test the form according to the condition rules, it was working.
Example, if I selected any option less than "8" then it shows the comment box
Can you please check again if this is still not working on your side.