I'm currently running PM 4.4.3 on a Quad G5 and 500mhz G4 laptop, and 4.4.3.2 on a Dual-core G5, and as long as PM is running, none of the machines will sleep on their own. If I select Apple>Sleep, the machine will do so, but this is the only way. I've had this problem since version 4.0, and have trashed the preferences, and installed new downloaded copies on brand new machines, with the same result. If PM is not running, the machine sleeps normally without fail. Any ideas?