Wow, am I ever glad I checked out this thread! I'm currently designing a quilt and am playing with putting log cabin blocks into it. Log cabin is a block that's been on my "try" list for a long time, but until reading these posts I had no idea of the possible complications. Jan, thank you so much for your clear instructions. It looks like a bias square ruler will now join my collection, too.
Unexpected learning - how fun!! Thank you.