It worked great, and the thirty-odd icons on my desktop forced me into a sense of vertigo when I test-ran it with "Cosmos", one of the ones bundled with 10.4 - but when I decided to click on Safari to buy a book on Amazon, it suddenly stopped. Why? Are we to sit mindless, like monkeys, staring at it? I admit that is what I did for the first three weeks or so, losing precious work time (kudos for that) but Wallsaver works for about half an hour, then randomly stops with or without windows open (but it is not as simple).