Using Geopak SS3 .722, I'm finding that when I have certain tools activated and I try to change Civil AccuDraw origin, Civil AccuDraw behaves strangely. I'll give a couple specific examples:
If I have Measure Area (other than using Flood or Points methods) or Measure Angle Between Lines or Measure Length or selected and I go to set my AccuDraw origin, I can select only areas. If I try to select a linear element, it winds up with some nonsense stationing that seems to have no meaning whatsoever. (I'm using Station-Offset.)
If I have Measure Radius selected, I can select only curved elements. If that curved element is a member of a larger, complex element, it still uses only that one segment.
If I have Measure Volume, I can only imagine what elements it will accept or what that will look like if it does.
I realize that this may not affect most users because they're not going to be as ridiculous as I am at investigating how things work, and since I know these things now I will easily be able to work around it.
It's clear that Civil AccuDraw's origin setting tool is somehow dependent on what the active tool can accept, and my hunch is that this is not working as designed, and indeed is irregular and (in my opinion) should be fixed.
The workflow I was doing when I discovered this strange behavior is that I was measuring areas and needed to know the station at the beginning and end of the area.