Double checking here ... are you using Poser 12, or Poser 2012? (They often get confused in posts). In either case, development on those versions have stopped because Poser 13 is the current release.

But one thing that comes to mind is that perhaps when you upgraded to Sonoma, it changed the text scaling or something on your system. I'm a Windows user and sometimes similar things happen when a new version is installed. 

If you are able to open the Preferences dialog in Poser, there is a UI Scale setting (I believe in the Interface tab). I would set that to at least 2 to see if that improves things.