It seems that alpha channel support is not available. Please make sure you have Xorg & ge; 6.8, and have installed the kompmgr that came with kwin. Also, make sure you have the following entries in your XConfig (e. g. / etc/ X11/ xorg. conf): Section "Extensions" Option "Composite" "Enable" EndSection And if your GPU provides hardware-accelerated Xrender support (mainly nVidia cards): Option "RenderAccel" "true" In Section "Device"
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