.NET

[#1]

Well, as an interesting data point, if I try to run Kean's code in Civil-3D 2008, I get the same results that he does. It's only when I try to run it in Civil-3D 2009 that the leaders only come out the left side.

[#2]

Sure enough, Kean had the answer.

The MLeader works differently in the 2009 series of products. Include this line as the last step, after creating the MLeader and just before committing the transaction:

mld.MoveMLeader(new Vector3d(), MoveType.MoveAllPoints);

Since it uses a 0 vector, this doesn't actually move the MLeader, but it forces the geometry to be recalculated.

[#3]

Good to hear the resolution.