I looked many Civil3D related forums, and unfortunely didn't found the answer for this problem.
I mention, thant this thing happens not only in my project file. I started new simpliest file from scracth and found the same troubles.
Right now talk about modelling corridors.
We design railway with 2 and more parallel alignments. To see them all on Multiple Section Views -we use Assembly Offsets, and remap offset Alignments and Profiles in Corridor Properties.
The problem happens, when Main Alignment stations are not the same, than offset alignment.
For example main road alignment stationing starts- 100+00, and offset road alignment starts - 0+00.
If we want to see offset corridor feature lines - we cant! Because that stationing, that mentioned in Corridor Properties for Offset Alignment - is taken from Main Alignment, but feature lines are plotted using the sameMain Alignment stations numbers on Offset Alignment! So we cant see offset corridor feature lines, because they are somwhere at station 100+00, but our offset alignment length is about 50m.
If we override main road alignment start from 100+00 to 0+00 - its OK, because now Offset Alignment Stations are in limits of Main Alignment. But, if main alignment starts with number, that is greater than Offset Alignment Lenght - it is no possible to see corridor feature lines.
Howewer, if we select region in Corridor Properties - it highlights all OK! But there is no feature lines.