ACA 2012 - ordinate dimensioning & UCS origin

[lisa.manley]

My office just upgraded from ACA 2010 to ACA 2012 and are experiencing a little trouble when it comes to ordinate dimensions.

We are trying to dimension a section while in paper space and can't seem to get the ucs origin to associate to the ordinate dimensions. The section consists of both the line work automatically generated by AutoCAD as well as additional lines that we have drawn in on top of the section.

We have been using the following commands:
UCS > M > selecting a point on the 2D section (in paperspace)
DIMORDINATE > selecting various points on the section line work

If the section consists of only the automatically generated line work, the dimensions work fine with the zero dimension and the dimension origin at the point specified by moving the UCS
If the section contains both the section line work and the additional line work the ordinate dimensions and the origin points for the dimensions are shifted into space so we end up with arbitrary dimensions like 73' 5-3/16" instead of zero, etc.
If the section line work and our additional line work is merged (select section, right click, edit line work, merge) then the dimensions will work. This however is not a real solution as the coloring of the line work is changed to monochrome and we need to be able to use various colors for different lines.

Is there some new feature in either the ordinate dimensions, UCS, or sections that is causing this issue?

[lisa.manley]

Here is a quick example of what results from trying to dimension a section.

In the attached PDF, the left side of the section contains only the line work generated with the section. The ordinate dimensions show up fine with the zero dimension matching the UCS origin.
The right side of the section has additional line work (red) that was drawn in on top of the section line work. The dimensions will show up correctly IF the point selected is part of the original section. If the point selected is part of the additional line work then the origin point is shifted off into space. The 469' 3-1/16" dimension should be the zero/origin point and the 467' 11-1/16" dimension should be 1'4". Both of these dimensions are taken from the additional line work. The 1'3" and 5'4" dimensions show up correctly because they are associated to the original line work.