got to spend some quality time with my seam ripper. I sewed the solid/neutral triangles and started on the solid/constant. Then I decided I'd rather sew with the constant to the bottom, but did not rotate my triangles. So when I went to press, discovered I had sewed them so that the solid was on the wrong side for one set.
Got them all unsewn and ready to have another go at it. At least there were only 48 of them!