Ok, I lowered my seat just a tad. I don't know if there is a cause and effect relationship. I've been noticing more tingling and buzzings in one thumb. I know the question may have been asked many times, but I'll ask.
If the top of one thumb is bothering you, how do you change your positioning? Lower seat, raise seat, change handlebar height? Or what?
FYI- changing gloves does not make a difference. 3 different pairs of padded gloves and same effect.