Please try below steps and see if it helps:
1. Close Muse and rename the folders named tk1 and tk2 in the following location
%appdata%\com.adobe.AdobeMuseCC.2015.0\Local Store. You can type this in the Path bar at the top of the Windows Explorer window
2. Launch Muse and add the font again.
This problem occurs if you have installed in at least one buggy font. The only way that will solve the problem - to remove all of the fonts that can be removed. In the future, install fonts according to one and check in Muse. If you are installing another font and system font no longer visible, remove this font. Best Practice - installed in the system only those fonts that you want to see how web fonts in Muse. To work with all the other fonts in other applications using the font manager. Do not install them in the system. It would be better for your system and for the Muse.
1 person found this helpful
Thanks for attempts to help me but my problem has solved easy as possible.
in font setting (control panel in windows) go and uncheck "hide fonts based on language settings".