The FM version is 10.0.2.419. The colours we use are the standard colours provided in the character designer under background colours. The FM maker.ini setting has not been changed from the original setting provided by FM.
Unfortunately, this doesn't work in FM10 (or 11) using the CMYK settings - you have to use RGB and convert the colours either in the PDF (with tools like Enfocus' PitstopPro) or during the postscript stage with a tool like PubliPDF (see: Grafikhuset Publi PDF for GPL licensed freebie version; usage details and other info is available at: Welcome to Grafikhuset Publi PDF ).
You could also try using the CMYK joboptions setting in the RGB mode to see if you get an acceptable conversion (however be aware that any graphics and images in the documents may be affected). You should also set GetLibraryColorRGBFromCMYK=None to prevent FM from trying to do unnecessary colour conversions.
The background colour feature works correctly in the CMYK mode starting only with FM12.