I am intrigued by this. More details, please?
Well, you really can't make good pickled corn out of sweet corn...the best pickled corn is made from plain ol' field corn that's picked when it's tender and young. Back in the day folks used field corn for sweet corn...but it wasn't all that sweet. Had a corny, nutty flavor. They grew it for livestock, but would pick it early and tender for eating or pickling.
Pickling corn using sweet corn gives it a flavor somewhat like puke~a sickly sweet/sour taste that leaves a bad backnote...might have been what BB's granny did wrong.
Another thing I'm finding....the original pickled corn seems to have gotten lost a generation or two back. Now the only thing you get when googling info on it are people who have recipes or instructions for "quick pickled corn", which is NOTHING like pickled corn. They even put vegetables and jalapenos in it!!!

Those are two flavors that should NOT go together. Nor should pickled corn be cut off the cob if one is a purist...it's pickled properly in a crock, whole cob. Cut off the cob and pickled it will turn to mush. They also try to blanch it before pickling...another mush maker.
Simply put, folks have forgotten how to pickle corn along the way, as the older generations died out and didn't pass that info along.
Granny used to make pickled corn, and I'd rather eat manure.
Done right, BB, it's addictive. Just need the right corn, which is harder and harder to find nowadays. I looked at several mags and they didn't even sell a corn that wasn't sugar enhanced, popcorn or dent corn. Finally found one~Baker's Creek~that had ONE variety I would consider good for pickling.
Will let you all know how it turned out if it grows well.