Inventor to DWG Colour Issue

We have an issue with converting Inventor R2009  *.idw files and saving them into Autocad.dwg.  When doing a print preview in autocad, using monochrome pen settings, some lines and text are not black, but retain the colours used in the *.idw file. This seems particularly evident on text and sketched lines from Inventor.

Has any body has similar experience or knows an answer ?

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Nova Design