If the problem is that snapping is preventing you from being able to relocate points, try turning off automatic snap before dragging the spline endpiont. It's in Tools==Sketch Settings==>Automatic Snap. I think the default shortcut is ALT+F9
However, splines that have several points or constraints can get fickle when you try to relocate one of them-especially if they're created in a 3D sketch. In this case, suppress some of the constraints before relocatnig the point and then try to unsuppress them. You can also run into problems dragging out endpoints if your spline is converted from the edge of a fill surface (like a loft or a boundary with tangent conditions)
Also, sometimes it's easier just to draw a line segment and add a coincident relation between it and the spline-point that you want to move-and then delete the line.
You might try holding down the shift key while you drag the points. That may stop SW from snapping to anything.
I am having same issue along with a co-worker. Have you found a solution? I have tried all suggestions still have problems editing spline.
To add how I can duplicate problem here is what I do:
Create circle on any plane (to do a sweep), create 3D line from center of circle (line is normal to circle center), create 3d spline from end point of line (just two endpoints), add tangency to line and circle. At this point all is good, I can move end point and control point with no problem. Exit 3d sketch and create sweep. Now go back and edit 3d sketch by endpoint (or control point). I get same results. You can only move in small increments now. If anyone has any other suggestions please post.
Solidworks 2014 sp5
Solidworks "legal" Dell workstation
I have attached a sample sweep file created in 2014 sp5. Can someone still running 2014 try and edit the 3d spline sketch by moving the endpoint some fair distance.
I found if I delete sweep feature I can edit spline normally.
Test Sweep.SLDPRT.zip 134.8 KB
Thank you Ingvar,
Something so simple and overlooked.