Urgent problem with font !!!

I have a new pc with window 10 and corel x7.

I have a problem with the fonts, which had never happened !!


If I open a document created a few days before it does not find the fonts even if they are installed !!

By checking bistream, the characters are installed but the preview is not visible.

So I have to uninstall and reinstall the font and everything is resolved.

I've been using this version for quite some time but it never happened to me !!

It's a serious problem because the characters are replaced without any warning !!

Can you help me ??

thanks for your help

Luca