I'll admit I didnt read all the replys to this. I have had shin splints bad and a running friend of mine said first off, Loosen your shoe laces. He's done 3 Iron mans so I took his advice. He stated from his trainer telling him the same thing that what happens is when you tie your laces so tight the tendons from the top of your foot to your shin are moving on the shin too much cause they are restrained by the laces.
Second issue. If you have pain on the inside, below the leg, on the shin. Say 2-3" below the joint but on the inside of the shin that could be Pes Anserine (Knee Tendon) Bursitis. I dealt with it for months upon months thinking my knee joint (previous MCL damage and Meniscus tear 08 ) was taking a !!!!. After google searching and finding the link below I began stretching out my Hamstrings both normally and with (say left leg) turned inward to localize the stretch to the inner ham/thigh. Took about a week and a half but the pain went away completely. Zero issues. Until I stopped stretching and it came back.. Repeat above process.
Sucks getting older and stiffer. Things dont work like they used to. Hope you're doing better now tho.
http://orthoinfo.aaos.org/topic.cfm?topic=a00335