Update Notes - Odd font declaration / choosing system - Font Undefined?

Put the summary of the bug you're having here

What I expected to happen was...:
The launcher would open to Update notes with readable text.

What actually happened was...:
The launcher opens to Update notes with the css "Ahem!" testing font selected.

Steps to Reproduce:
1. Install CSS test suite fonts: http://www.w3.org/Style/CSS/Test/Fonts/css-testsuite-fonts-v2.zip or attached
2. Open the launcher.

This is for the launcher version 1.2.4, but that option is not available.