I realized that the version of Yashomudra font that I was having trouble on my Mac was a 2013 older version.  The 2015 version installed without any problems.  I like this font a lot, though I see that the alignment of signs like "े", "ु", "ै" etc. with the vertical stems of the Devanagari characters is not as good as in Sanskrit 2003.  What I like about Yashomudra is the variable length of the sign for short "i" depending upon the width of the consonant sign and consonant clusters.  This is something I do not see in Sanskrit 2003.  I had worked on this feature in my old Chi-Writer Devanagari fonts in 1980s, which no longer work on newer computer systems.  I hope that the new version of Sanskrit 2003 that Vikram Bhaskaran's team is working on will deal with some of these issues.  I would be happy to do font testing for this team.

Madhav