Font panel in CC App fails to load

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If you are having trouble syncing fonts from Typekit, please try the troubleshooting steps found here:

sync troubleshooting guide. You can also see this thread where a similar issue has been resolved:

Re: Typekit fonts not working with Creative Cloud app

Hi,

You may please Use the Adobe Creative Cloud Cleaner Tool to solve installation problems

After uninstalling the creative cloud please follow the steps mentioned bellow-

Remove the OOBE and AAMUpdater folders.

Mac OS:

•    Quit all the Creative Cloud processes from activity monitor.
• Navigate to   \User\<UserName>\Library\Application Support\Adobe*

  And /Library/Application Support/Adobe* 

          To access the hidden User Library folder, see Access hidden user             library files | Mac OS 10.7 and later.

• Locate and remove the AAMUpdater and OOBE folders
• Remove Adobe application manager and creative cloud desktop from> Utilities folder.
• Re-download Creative cloud from -

  https://helpx.adobe.com/creative-cloud/help/install-apps.html 

Windows:

• Quit all the Creative Cloud processes from task manager
• Navigate to \Users\\AppData\Local\Adobe\

  And C:\Program Files (x86)\Common Files\Adobe 

C:\ProgramData\Adobe

• To view the hidden AppData and Program Data folder, see Show hidden files, folders, filename extensions | Windows XP, Vista, Windows 7.
• Locate and remove the AAMUpdate and OOBE folders
• Re-download creative cloud from -

https://helpx.adobe.com/creative-cloud/help/install-apps.html

Regards,

Akanchha