What kind of font did you use? Webfonts, I hope? Where did you have the font from?
Like Uwe said, you are probably using an unsupported fonts. Ensure that all fonts that you used are available on your site or are part of your subscription plan.
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There might be an issue with your Typekit account.
The first step we can try is signing out and signing back into the Muse and see if that works.
Go to Help > Sign out
Close Muse > restart your system > and relaunch Muse where it shall ask you to sign back in.
Please sign back in and see if that works!
Let us know how it goes.