Version:           kdeplasma-addons_4.3.2-0ubuntu6 (using KDE 4.3.2)
Compiler:          gcc 4.4.1-4ubuntu8 
OS:                Linux
Installed from:    Ubuntu Packages

The KDEµBlog Widget has a FlashingLabel on top that shows notifications about new tweets/characters left/etc.
The bug is that the notification text is ALWAYS black. That makes it hard/impossible to read if you're using dark themese like oxygen.

The cause is following line in applets/microblog/microblog.cpp:
m_flash->setColor( Plasma::Theme::TextColor );

this is an attempt to set the color to the theme text color. BUT TextColor is an enum value used by the Theme indicating what color value is used, not the actual color value. The correct way to set the color would be:
m_flash->setColor( Plasma::Theme::defaultTheme()->color(Plasma::Theme::TextColor) );

With that the correct text color for the current theme is used (on initialization).

LP report: https://bugs.launchpad.net/ubuntu/+source/kdeplasma-addons/+bug/486631