Reproduced with Inkscape 0.91 r13725 and 0.91+devel r13909 on OS X 10.7.5 (tested with cairo 1.12.2 and cairo 1.14.0): the rasterized content of the EMF file imports with a black background, the same happens with local EMF export (the transparent regions of the bitmap image embedded in the SVG file are black when reopening the EMF file in Inkscape).
Reproduced with Inkscape 0.91 r13725 and 0.91+devel r13909 on OS X 10.7.5 (tested with cairo 1.12.2 and cairo 1.14.0): the rasterized content of the EMF file imports with a black background, the same happens with local EMF export (the transparent regions of the bitmap image embedded in the SVG file are black when reopening the EMF file in Inkscape).
@David Mathog - any chance you could take a look?