You could try backing up ~/.kde4/plasma-appletsrc, removing it, and restarting KDE. This should give you clean default plasma settings and determine if a bug in an older version of plasma messed up the config file.
You could try backing up ~/.kde4/ plasma- appletsrc, removing it, and restarting KDE. This should give you clean default plasma settings and determine if a bug in an older version of plasma messed up the config file.