shader - FXC /Od problems on DirectX 10 Hardware -
i'm having weird problem fxc , directx 11. running on directx 10.0 compliant (admittedly crappy) integrated graphic card, shaders not working if use fxc compile them @ build time flag /od. looking @ graphics debugger in vs 2012, see input assembler , vertex shader stages of graphics pipeline correctly, pixel shader stage missing, geometry never drawn framebuffer, so: 
using /o0 works, lose ability debug shaders (optimizations, @ /o0, seem scramble instructions, don't match .fx source file)
on machine, directx 11 card (gtx 560), /od works fine.
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