Corridor feature line problen

[nikoue]

I model a difficult for me corridor with a lot of bike ramps and sidewalks. In one of them in which i apply the same modelling technique as in other three i have a corridor feature line connection problem which you can see in the first picture. In the other three i have another feature line connection problem witch affects the render material,which you can see in the second picture.  The assembly i use is custom, If i use the same assembly as the sidewalk i don't have the same problem. But with that i can't control the link codes. The strange in my case is that i have set in my custom subassembly the same point codes as the sidewalk program assembly with which i have not have the problem and i change only the link and shape codes.
Is there any way to manually control the feature line connection?
I find very difficult to model complex urban environments with civil 3d tools.

[Civil3DReminders_com]

I'd double check the alignment, profile, and targets for the erroneous ramp. I usually turn on and off regions and usually am able to quickly see what region is the providing the trouble. 

Yes, Civil 3D really needs a curb ramp object to solve the difficulty of modeling non-linear objects.

Idea Station Post: http://forums.autodesk.com/t5/autocad-civil-3d-ideastation/curb-ramp/idi-p/5800745 and yes I am a pissed of individual do to the fact we don't have Civil BIM despite 7+ years of Autodesk marketing about it. 

[nikoue]

When I isolate the regions the problem disappear. When I unisolate it came back. That happens with all the regions that take part in the area that the problem occurs.