Inkscape have just published an issue affecting Windows users of the open source SVG graphics app. The issue may also affect other apps that you use, and is attributed to two updates released by Microsoft.
To our Windows users… Microsoft pushed out bad updates that affect rendering (visibility) of certain fonts in seemingly all applications. If you run into the issue and it’s hurting your productivity, you’ll need to uninstall the updates for KB2753842 & KB2779030. (this is not an Inkscape issue)