Ugh!

I'm sewing the sashings and cornerstones on each block and then the blocks together. Clearly, however, I need to do one block at a time.

I had trouble sewing row three to row two -- my seams weren't nesting like they should have, but I plowed ahead and sewed the long seam. Then I started putting the sashings on the next row. It was wasn't until I was putting the individual blocks back up on the wall to verify their placement that I realized I had a problem.

I'm off to frog.