So, usually, when I activate a font (using FontExplorer), I'm able to jump back into Illustrator CS6, and use it immediately.
Now I have to restart Illustrator, each and every time.
Started a week or so ago, what can I check?
You may try to Move the folder with Illy closed (reversible), or just Ctrl+Alt+Shift/Cmd+Option+Shift during startup (irreversible) to reset the preferences.
That did it! Thank you!