Font substitution When converting FM11 file to PDF

I am working in a FM11 – Win 7 environment. We upgraded 2 font families recently:
Imago Book upgraded to Imago BQ
Bembo upgraded to Bembo Std

I am attempting to save a FrameMaker 11 file as a pdf. When I attempt to do this, the pdf is not embedding the Imago BQ Bold font. It is substituting it with Imago BQ BoldItalic. I am pdfing a number of FM11 files that have been formatted in different templates. I am not experiencing this problem with these FM11 files. It is only occurring with a set of FM11 files formatted in one template.

I can’t figure out why this font substitution is occurring. Has anyone encountered this issue ? How do I resolve it?

I am using Adobe Acrobat X Pro.

Thanks,
Brenda