I'm using Civil 3D 2011, I have had an issue when it comes to trying to break my feature lines. This occurs occasionally and I'm not sure if it's a setting I need to change. When I go to break a feature line it wont let me pick between two points. It just terminates the feature line at the first point, deleting the rest of the feature line. The trim will act up in a similar maner, for example trimming on the oposite side that I've picked. Any help with this would be appreciated thanks.
I have seen this issue when working with a UCS other than world. Most of the feature line tools don't understand a local UCS.
I tend to set the view to whatever I want, typically the plot view, then set the UCS back to world and work that way.
Hope that helps
Conan Witzel
Civil 3d 2012 Sp1
Windows 7 64 bit