Good question! I am really a little surpised at how many answered yes. For me it depends, a lot of blocks you really son't want to square up as you will lose your points. If my block is just a tad too big or too little (I measure when I do the first one) I just go with it and ease it in. However if it is more that just a tad, I take a look to see what the issue might be - a miscut piece, seam too big or too small. Fix that and my next block(s) should be good to go. Now if we are talking a block that doesn't have any points or something like half square triangles, yes I would square them up.