15.0.1 doesn't find fonts in document fonts folder
If I open a document that has a Document fonts folder [in the same folder as the document itself], InDesign 15.0.1 consistently fails to find those fonts or let me select them. So the document opens showing all those fonts as missing and there's no way to fix the problem.
Peter Crownfield commented
It also fails to find some system-installed fonts; even Find Font doesn't include them as options.