The Extensis font panel in Illustrator was working perfectly, giving previews to all my fonts and letting me activate them with one click. Yesterday, after a reboot, it stopped working. It would show previews for some fonts but not most, which it would show the font names in a generic font and not allow me to activate them by clicking.
This morning I uninstalled Suitcase Fusion, rebooted, deleted c:/users/myname/appdata/local/extensis, rebooted, ran ccleaner, rebooted, reinstalled Suitcase Fusion, reloaded my font library. No luck. Actually it's now worse, only showing font previews for very few of my fonts.
I lodged a support ticket but I'm posting this here too, in case anyone else has the same problem. I haven't heard back from support yet, and I can't afford to lose much more time, this is a production computer and I have client work that needs attention.