A weird situation I'm in right now - Fonts disappear in 1703?

I updated to 1703 on the 7th of April using the Media Creation Tool. Then I updated to the latest bugfix build and this happens.

The fonts disappeared. See the attached image below. Restarting seems to fix it, and Word seems to report that it's "out of memory/disk space and can't show fonts" and then extends to Windows. Every new dialog box has its fonts missing. The only apps unaffected are modern apps.

I saw this issue on the 14th. (maybe 13th, I forgot)

The attachment shows the issue in winver.

You happen to be using Symantec or Mcaffee?

Add exclusions for FontDrvHost.exe and try again.