As merely a datapoint for others' consideration in case they experience the same thing: I have a 15" 1.5Ghz Powerbook (the last model BEFORE Safe Sleep was introduced). I had used the Safe Sleep hack to get Safe Sleep to work, and it worked flawlessly up until 10.4.5 Since 10.4.5 however, "SystemUIServer" has not worked properly after waking from Safe Sleep. I have been forced to hard-power-off the machine on more than one occasion. It may be mere coincidence, but I mention it as a factoid for others to consider. TjL