Crashes on Windows 10 version 1909 (November 2019 Update)

I got a note from @mikeowen that a few customers have had issues with applications crashing (Deadline included) when upgrading Windows to build 1909. So far we have one report where Mantra was involved. It seems that 1809 doesn’t have issues.

Has anyone tried upgrading yet? Just doing some research here.

Turns out FontSync seems to break things. We’re not sure yet what part of it, but likely the RegisterFont() call which sends a Windows message to all open windows.