https://forums.autodesk.com/t5/inventor-forum/surface-modelling/m-p/5532643#M383994 It may be that your geometry is not continuous. Check that the end points are constrained and you have at least tangency applied.<BR /><BR />Use the 'close loop' tool to check, right click on any line our curve to find this tool.<BR /><BR />Finally, if you don't get the full curve, pause over the curve when selecting, or right click and choose 'select other'. Sun, 08 Mar 2015 19:14:03 GMT PaulMunford 2015-03-08T19:14:03Z