I have been having an odd hamstring problem for several weeks. Turns out that I had somehow wrenched my tailbone out of alignment w/my pelvis, which led to my pelvis and hip joint becoming out of alignment, which led to hamstring pain when I ride (especially when I go up hills)

Rest, ice, and arnica only went so far. I finally went to a chiropracter that I trusted and he put everything back in place. Now I'm waiting for my muscles to stop freaking out over the adjustment *wry grin*, but my hamstring does feel better!

I hope you are able to find a solution soon!

-j