Operating system and graphics card
Broken: (example: 2.69.7 4b206af, see splash screen)
Broken 2.79 RC1
Short description of error
The theming for the text in the User Preferences in the Addons tab seems to have a regresssion. The color doesn't change anymore when you adjust it. It remains black.
Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps
Open Blender, open User Preferences. Go to Themes tab, click at User Preferences. Change the text color. Now have a look in the Addons section. The text at the addons panels should change too. But it remains black. Which is a problem with dark themes that needs bright letters. The addon panels becomes unreadable.
Left 2.79, right 2.78