Reply To: Missing Fonts in IND but avail in AI

Related question, but with slightly different particulars:

I created an InDesign file with 36 instances of a placed Illustrator file (with 36 artboards) 3 months ago. All displayed fine.

Three months later want to make some small modifications, and having trouble with font display.

The Illustrator file contains Myriad Pro in Regular, Italic, Semibold and Light styles. It displays properly in Illustrator. The InDesign file also includes text in Myriad Pro in all four styles, all of which are displaying correctly. So the font appears to be fine and activated correctly.

However any instances of Semibold, Light, or Italic in the placed file are being replaced with a default font (Arial?), whilst the Regular weight of Myriad Pro is fine.

Using latest versions of InDesign CC (11.3.0.34) and Illustrator CC (19.2.1), with FontExplorer Pro (5.5) font management.

Help!