In my newbie opinion, the AutoSketch objects (e.g. hatches, dimension labels) that are not a part of the drawn lines have undocumented "black box" behavior influenced by various things. In case it helps, here are a couple of the less obvious things that I think influence that:
- Setting the scale in the "new drawing" wizard is different (and seem to work better than) setting it later
- The hatch settings in Tools->Graphic Options -> Current
- In Tools-> Drawing Options -> Scale the "apply scale" checkbox and the two unexplained icons to the left of it.
- Whatever the settings are in the "template" that the drawing started from.