Been riding with SPD clips for some time but today I experienced something new. When I took my shoes off, my left big toe was blue and all my left foot toes were numb. Right foot was OK. I have heard that some people have experienced similar problems with SPD clips. Is this something caused by a poorly aligned clip? What kind of adjustment will eliminate this problem? I am assuming it is caused by localized pressure on the botom of your foot where the clip is located??????