After wasting some more of my precious green yarn, I have succeeded in starting my second round on a green starting chain with reasonably even stitches. The chain is kind of twisty-looking, but I think I can straighten it out. This is fortunate for me, since I have yet to find the tapestry needle I could swear I've seen no more than six months ago.
Here's a more interesting nalbinding tidbit about nalbinding. This costume blogger suggests that nalbinding may have come about as a way to use up loom waste--odd bits of thread cut from a loom during the cloth weaving process. Her suggestion may not be provable, but if one considers it in light of the importance in early times of carefully using every bit of handspun thread possible it makes a certain amount of sense. I intend to think about it some more.