Just spent half a day trying to figure out why the hell were my automation scrips not running.

"There was an exception but the IE JS engine didn't return any error message"
Very helpful

Turns out the dropdowns that looked the same weren't the same. There was a different table for each selected radio button that was getting displayed and the dev tools didn't reflect that in real time.

I managed to notice after spending a while in table hell (we're talking 4-levels deep nested tables)