I think V-Carve Pro is getting confused because the dados are touching. The dadoes need to extend beyond the parts by half the tool diameter, or the dadoes will not be fully cleared.
I'll play with it tonight using a toolpath template. I believe it should work.
If you create a pocket toolpath separately for each dado, it should also work.

You must be doing something wrong, as it works fine for me.

I don't know there was ever any doubt about that!   

What steps did you take to create the tool paths?

New File
48 x96
Import Vectors - Select the dxf file and it's imported.
Select the dados - Hold the shift key for multiple selections.
Choose the pocket toolpath, select a 1/2" tool, set the depth, choose contour, and OK.
That's it.

Thanks Gerry