All - I am using LyX 2.2.1-1 on macOS 10.14. I can no longer distinguish boldface fonts from ordinary fonts in the LyX document, although they appear correctly in the pdf output. This is the case both when I enter the bold face font by hand or when I use an environment like Theorem. Is this a known issue? Do you need an example? The problem is obvious even in a two word document with the same word first in bold face and then not.
Thanks, Hal
