I think I've seen this before. From your log (thanks for attaching that) it seems that your Intel card is still being used:
Initializing OpenGL graphics device at 1024x768 with 32-bit color...
Initializing WGL...
Requested WGL Video values = R: 8, G: 8, B: 8, depth: 24, stencil: 8, double-buffer: 1
Actual WGL Video values = R: 8, G: 8, B: 8, depth: 24, stencil: 8, double-buffer: 1
OpenGL Vendor : Intel
OpenGL Renderer : Intel(R) HD Graphics Family
OpenGL Version : 3.1.0 - Build 8.15.10.2430
This might be because you set the normal/release executable to high performance, but not the debug executable. Can you check that, then if necessary create & post another log? If you've already done that, then you need to do something else in order to get your nVidia card to be used by Diaspora. Sorry, I don't have a setup like yours so I can't offer much advice off the top of my head. There might be another thread in the tech support forum with a solution...