Disapeared the used font by restart Website X5 prof next time 
Auteur : Leo L.
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Everytime i open website X5 prof. the programm tell me the used font New Baskerville is missing. So I add it to the website every time again. After doing this it looks OK. But as you restart the programm next day the same error appears again.
Posté le
If you add this through a font type pulldown menu then that should be fine, save when done.
Besides this, are you running the program as admin? If not try this maybe this helps.
maybe the same issue ...
https://helpcenter.websitex5.com/fr/post/228861