Starting in December, we will archive content from the community that is 10 years and older. This FAQ provides more information.
Check your targeting.
Look at Event Viewer and read the errors. Don't know what they mean? Post here.
What does Target mean?
Surface or polyline??
Many subassemblies have intelligent points that can "target" another alignment, a polyline, or a feature line for the subassembly width. You might enter 12' as the default width, but that can be overridden by targeting. See the Targets column in Corridor Properties, Parameters tab.