[scribus] Disappearing fonts

[Dismore Marilyn]

Hi -
When I opened a new text box on the document I've been working on for weeks and selected properties, the font I have been using, Calibri, was no longer available. If I select file > document setup > fonts, it is still listed as being available. The pages I've already set up are still in calibri, but the new text box defaults to AR BERKELEY, and when I scroll down the list to reset it, calibri is not there. 
What has happened, and how can I get it back?
Mouse.
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