Anyway, I've been smoothly chugging along the gusset and heel of the pomatomus socks until I noticed a weird pucker.
What? I kept going.
When it came time to k3tbl instead of k2tbl, my stitch count was off.
Then I went for another round until I took a good hard look at the chart. Well, I haven't followed chart B at all! I didn't do the uneven chart thing that happens once in a while that shifts the pattern left/right.