Fields not showing up when added to form - gray area, form goes unresponsive

Hello. I’m using version 2.9.2 Gravity Forms Elite, running on 10 sites and in all of them, every time I try to edit a form or create a new one, droping the field on the screen, all I’ve got so far is a gray area and the form goes unresponsive.

I’ve already tried changing the theme, disabling plugins, rolling back theme and wordpress versions, also I changed from Chrome to Firefox and nothing. Nothing works.

This is what I get from the JS console:
VM443:1 Uncaught SyntaxError: missing ) after argument list
at sack.runResponse (tw-sack.min.js?ver=1.6.1:2:2060)
at xmlhttp.onreadystatechange (tw-sack.min.js?ver=1.6.1:2:2873)

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