Ran an easy 4 (8:44 pace).
Now, my massage therapist figures it is a hip alignment issue causing my groin pain. After manipulating my left leg and hip, there was a distinctive "pop" as it went into alignment. She figures that was the source of the problem and the solution.
I have to say that although there is some lingering groin pain today during my run, it's not as significant. So, I don't know if it's something now that will fade away or if there is something else that needs time to heal. Either way, I'll have to focus now on hip stretches in addition to everything else.