kUbuntu kickstarter transparency

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http://askubuntu.com – I have a problem on Kubuntu, the kickstarter (start menu thing) was transparent till today, now its not transparent anymore, and I didn't changeany settings or so, all my theme things are like before (transparent windows and so on) just the kickstarter is not transparent anymore... How can I get the transparency back? I am on an Acer C7 notebook... I have another PC running ubuntu and there the kickstarter is transparent (with the same theme) oxygen black I think it's called. (HowTos)