I am trying to create a rehab corridor and every time I get to the parameters dialog box it crashes when I change the number of lanes from 0 to 1. The first drawing I tried was an older drawing that had the survey in it, the road survey was about 2.5km. Then I tried using a more recent drawing with a smaller survey, about 0.5km road survey and it still crashed. Then I tried creating a new drawing using our company template and brought in the smaller survey and again it crashed. Finally I tried starting with the _Autodesk Civil 3D (Metric) NCS.dwt template and again brought in the smaller survey and again it crashed when changing the number of lanes form 0 to 1. Has anyone been successful in using the rehab corridor, or had similar problems? The tool looks like it would be very useful but I cannot get it to work.