Yes, I square on every round.
http://quiltingcorgis.blogspot.com/2...log-cabin.html
It may be hard to see on my Dr. Seuss log cabin - but the fox in socks block is slightly wonky because I screwed up the trimming.
The place I noticed this most was when I started piecing the blocks together and discovered that my outer logs were slightly different widths so that they didn't line up correctly - all of the blocks are the same measurement, but I missed something along the way.
Cheers, K