hi everyone! i just bought a pair of ryka alchemy II on sale. i have never worn ryka's before and love them aside from the fact that my toes on my left foot go numb while i'm working out in them! yes, it only happens on one foot!!?? has anyone ever had this problem and can offer a solution? i don't think there's anything unusual about my feet, but i do have high arches if that means anything. thanks in advance!