You create a hatch in the drawing and the hatching doesn't look as it should.  Why?

It seems some hatch patterns (concrete included) get distorted when the hatch is located a large distance from the drawing origin (0,0). This will regularly be a problem when you have your survey origin on MGA co-ordinate system when the default hatch 'origin' is set to the drawing origin.

There is a workaround - you are able to set the Hatch Origin for a particular hatch object (and you should be able to 'format paint' this across to other hatches).

Autodesk have documented this in their knowledge base - the link is below:

http://usa.autodesk.com/adsk/servlet/ps/item?siteID=123112&id=10100419&linkID=9240617

Version: Civil 3D 2010, 09, 08, 07 ,06