Matlab calling C# functions - different results depending on whether you use Matlab or MCR

We have the following interface defined in C#:

[ComVisible(true)] [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)] public interface IIPHelper { double[,] GetXValues(ICurve curve, int depthIndex, int yIndex); }

and, when it is called, should return an array of values. If we are using full-blown Matlab, the result is correct (a 1*200 array with the correct values). If we access it through compiled Matlab, the result is always a 1*1 array with no data.

The matlab code snippet that calls the function is:

   %read VDL at that row
   global IPHelper;
   VDL=IPHelper.GetXValues(STCCurve, i, nslows);

When debugging the implementation of the C# interface, the correct array is calculated in both cases. It's just that the compiled version doesn't return the array correctly.

I should say that, for various reasons, we are not referencing MWArray in the C# code and are using reflection to make calls into the Matlab DLL.