The fact that this started not long after 10.5.7 may be a coincidence, but I suspect it isn't. Ever since the update, my machine has occasional spurts of Firewire simply not working. It still shows up in System Profiler, but neither my external drive or my camcorder will actually connect using it. The only way I have found to clear it is a reboot. Anybody else experiencing this, or want to give me some help?