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I have TelldusCenter 2.02, the blue TellStick and a mac with OSX 10.6 controlling a mix of Waveman and GAO receivers. Sometimes they work perfectly, but sometimes some lamps fail to turn on and off or none of them can be controlled at all (even if I restart). What's the problem? As the receivers fail randomly I'm quite certain it's the software.

For me it sounds like a range-problem.
Send an email with your address, batch number, and place of purchase to rma at telldus dot se in order to exchange your TellStick.