Back on 12-10-2010, dprovince asked about stretching an entity in one direction. He said it happened suddenly. The same thing happened to me. If I make a square and need to stretch it to the right, I click on the arrow and drag. I drags ok, but the left side also drags out. I must have accidently hit a setting or something. I can't find anything in the book or help files to solve this.
Henry