Many thanks to each of you! I have just done another row, taking extra extra care to pin it well at the intersections and to ease any over-large sections as has been suggested here. Maybe it was just good luck this time, but this row came out much better!
I'm not sure how to post a photo, but I will try. In the meantime, if someone wants to know, it's the "Out of Step" pattern by Libs Elliott -- I'm making it with Kona cottons for my decidedly-geometric and computer-oriented son.
Last edited by McGargantuette; 09-21-2016 at 03:44 PM.