None here on LR3 either in the past. New research begins tonight via the same source and will report if there are any seen.
I've noticed on a personal level (sans research) that when I eat low carb for a few/several days at a time, and then eat carbs - without fail I will have foot cramps for the next several hours at a time. They're maddening. It's likely an electrolyte / potassium balancing issue as I've read up on, but perhaps this could be an angle that you haven't looked at?