I am almooooost done--just finished the yoke colorwork and looking forward to all the decreases that will allow me to Get It Done.
I was held up by rounds 23 and 24. I made the suggested correction on r23, adding one MC stitch at the end of the repeat, and the round worked out correctly in pattern. But when I started r24, doing the double decrease and then knitting 2 MC stitches did not bring me to the CC stitch, as shown on the chart. On the needle I had 4 MC stitches before the CC stitch, so sssk, k2 overshot the CC stitch by one stitch.
I tried moving the sssk around in the repeat, but I could not make it work. So I went another way to achieve two stitches decreased in the repeat:
MC ssk. MC CC MC k2tog MC (r24)
This works out correctly in pattern for this round and allows you to knit the following round (25) as shown on the chart.
Perhaps all this was due to some self-created glitch--I don't see how, but I'll allow for the possibility! At any rate, this solution works for me, and if anyone else faces the same puzzlement I hope it will help.