I have been trying to do some surfacing in SWx 2008 SP5.0. Iwas in the process of fine tuning the surface by editing thesplines used to create it when I noticed the surface was notrespending to the changes. Turns out the spline wasn't actingproperly. I have an intersection curve and a spline which areconstrained to be tangent. When I created the constraint, thespline did as it should in moved into tangency. If I try to changethe spline by lengthening or shortening the intersect curve thetangent constraint does not remain in force. It's still there onthe list, it just isn't active (or something??) If I delete thetangent constraint and re-create it, it works -- once. Why would aconstraint only work when you first create it? Or is there someother way to apply a tangent constraint to a spline?

These are images illustrating the problem. First is the originalgeometry, then after editing the intersection curve, finally afterdeleting and re-creating the tangent constraint;

SolidworksSketching