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I just installed Arch and KDE. It all works fine except for compiz, which works, but any window opened goes to the top left hand corner and the title bar is hidden so I can't even move it.
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Start the CompizConfigSettingsManager (ccsm) and check if the window decorator plugin is enabled if you have no window boarders.
There is another plugin for windows placement (don't know how its called because my settings manager is in german).
Maybe you have to active a lot of other plugins before compiz works how you like it.
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Solved. I ran a profile export-import from another distro install and compiz works fine now.
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