Overview

For some users with Windows 7 (SP1) machines, the app crashes while opening the Editor window (right after the recording, for example), with messages like these:

Provide value on 'System.Windows.Markup.StaticExtension' threw an exception.

Cause

Keeping it short, this issue is caused by a faulty .Net Framework 4.7.1 update.

And if looked deeper, this shows up:

No FontFamily element found in FontFamilyCollection that matches current OS or greater: Windows7SP1

It means that the problem is related to a missing font resource.

Solution

Microsoft released a fix for this bug, you can take a look here:

https://github.com/dotnet/announcements/issues/53

Basically, you'll have to uninstall the faulty update or you'll have to run a tool to fix the issue for you..