Plasma Window Visible

[Andreas Hennig]

Hi,

since i installed KDE 4.5 beta on my kubuntu 10.4 there is a small window on my dektop without name. When i close this window also plasma desktop closes. Meanwhile i'm running 4.5 RC2 but this window is still there.
Is this a commom problem? How can i hide this window?

Best Regards
Andreas
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