INDD CS6 - fonts are not showing as available/open though they are. Anyone know how to get CS6 to see these fonts?

[Coreyography]

I have files that I need to work in INDD CS6 and the fonts are not showing as available/open though they are. If I open same file in CC INDD, fonts are okay – but I do not want to work the file in CC.

Fonts worked fine until just a few days ago. Very odd and inconvenient. Haven't changed anything on my system. It is basically ALL the fonts I use most often.

Anyone know how to get CS6 to see the fonts?

[Willi Adelberger]

What kind of font is making the problem?

[Coreyography]

Both Open Type and Postscript.