No shader debugging when using d3dcompiler_46 on Nsight 3.0 RC1

Shaders compiled with the new d3dcompiler_46 in the Windows 8 SDK are not debuggable in Nsight 3.0 RC1.

Here’s a pic of the (d3dcompiler_46) shaders incorrectly marked as ASM, which gives a ‘No debuggable shader associated with the requested pixel’ message:

and here’s a pic of the same shaders correctly compiled with the older d3dcompiler_43 (i.e. with D3DX11CompileFromFile):

Is there anything I can do on my machine to fix this?