Version: (using Devel) Installed from: Compiled sources OS: Linux If you use OpenGL for rendering desktop effects the panel and at least the center part of the 'panel-background.svg' is completely transparent no icon, widget or task is shown and cannot be clicked anyway. They are just gone. This is another rendering problem with OpenGL in KDE4SVN in addition to this bug: http://bugs.kde.org/show_bug.cgi?id=163054.
this seems to be covered in comment #3 of 163054 and is the same general issue. *** This bug has been marked as a duplicate of 163054 ***