[1.01 Bug (and earlier versions)] - SaveShape Crashes

I was trying to use the TSShapeConstructor command SaveShape to save a modified version of my DTS file rather than modifying every instance of it to add in the changes (and because the move out of SimDatablock doesn't play nice with other code in our client) but it appears that the saveshape is bugged. It crashes saving the .dts file and the resulting dts file is 0k as a result.

The code I'm using looks like this:

//--- OBJECT WRITE BEGIN ---
function Spruce2Dts0::onLoad(%this)
{
%this.addAutoBillboard(2, 4, 2, 0, 64, true, 10); 
%this.saveShape("./spruce2new.dts");
}

singleton TSShapeConstructor(Spruce2Dts0)
{
   baseShape = "art/shapes/trees/nveg/jc-spruce2.dts";
   upAxis = "DEFAULT";
   unit = "-1";
   lodType = "DetectDTS";
   singleDetailSize = "2";
   ignoreNodeScale = "0";
   adjustCenter = "0";
   adjustFloor = "0";
   forceUpdateMaterials = "0";
   canSaveDynamicFields = "1";
};
//--- OBJECT WRITE END ---

The autobillboard generation works fine if I comment out the saveShape, but the saveShape crashes me every time. I tried this in 1.0 and beta 5 also, and same results.