Operating system: Windows 10
Graphics card: GTX1080
Broken: 2.80, f98e4cbedbb7, blender2.7, 2019-01-11
Worked: build from 3 days ago
Launch Blender; drop a text object into the screen; select the Font property and browse to a folder containing font files; select the preview mode.
Font preview shows font styles in light grey on a white background. Legibility is greatly reduced.