Problem: Acrobat DC: Windows Explorer: right-click/Convert to...: "...problem sending the command..."

Is anyone else having problems using Windows Explorer through TCS 2015 to process PDFs?

I am using TCS 2015 on a 64-bit Win 7 box with 32 GB RAM.

My workflow includes using Windows Explorer shortcuts to create PDFs from .fm files using either/or "Convert to Adobe PDF" or "Convert to Adobe PDF and EMail".

Using either of those commands in Windows Explorer results in the error "There was a problem sending the command to the program", "the program" apparently being either/both FrameMaker 2015 and/or Acrobat DC (or Adobe PDF/Adobe Acrobat Distiller DC).

FrameMaker starts as it should, and the file loads as it should, but apparently when FM calls Acrobat, it can't start as it should.

I am a week out from a critical deadline of an internal workflow document discussing that exact functionality.

If anyone knows the answer, it would be of GREAT interest to me...

Thanks!

(Related screen shot below...)