I've had a tight hamstring and glute since before the marathon in April.  I thought that after a break and gradually building my running up again it would settle but it doesn't seem to be.  I've been to physio weekly for about 2 months now and not getting anywhere.  I really think I need a new opinion on this!  For now I'm going to spend 4 weeks doing more stretching and back my running off slightly.  Its nice weather out so a good time for cycling!