Thanks to an early morning slumbering stretch, my sacrum popped and has returned to it's rightful location, and I feel fantastic.
For future reference... I was face down and was doing a kind of a dynamic twisting stretch. I think pelvis was pointing slightly to the right at the start, and the stretch was initiated by pushing into the hands and feet, turned to pelvis to point to the left. A very definite and painless pop was felt. And immediately my body relaxed out of a state of tension it's been in since my lst week in Tokyo.
The last time this happened, a simmilar stretch also restored pelvic integrety, though I was face-up. Yes I had been trying to replicate that experience all through this bout.
Thankfully this time I was not in pain... just relentless muscular trauma as the muscles tried to keep firing to establish stability and support where the bones usually do.
Did about 5 minutes of equal standing... just soaking it in... and lovin'it.