Issue when moving Ducts, Pipes, Conduits or Cable Trays in Sections
This an Issue we hope Autodesk will fix in a future release.
When modeling Ducts, Pipes, Conduits or Cable Trays in a Section View where the angle between these elements is smaller than 24 degrees and you want to move one Duct, Pipe, Conduit or Cable Tray by dragging or moving it up or down, it moves the complete run.
Even if you change the elevation. Also if you change the elevation in Floorplan.
See also the screencast: Issue when moving Duct in Section View