You mean the license plate holder is cracking... try not to tighten the screws so much, it strains the plastic and over time with the vibration from riding, the cracks will appear... they are deemed stress cracks for a reason.
The plate itself, it cracks around the bolt holes. I wonder if its the centrifugal force of the rear tire that has something to do with it. I wouldn't have thought much of it if I hadn't seen the other Judge with the same problem. I was curious if anyone else had the same problem. I'd post pictures, but the plate eventuall broke off and I had to report it missing. If my new plate starts to crack again, I'll take a few.