At first it seemed Tiger was working fine on my Dual 1 GHZ G4 "Quicksilver". Then I noticed several problems, there seems to be a USB compatibility issue, my USB Hub no longer works correctly. When plugging in, then unplugging any USB device the Finder half-freezes, the clock stops, and the USB devices are no longer available. I had been wanting to upgrade to USB 2.0 anyway, so after installing a card it half-fixed the problem. Now, the issue is only with my Brother HL-1440 printer. When I try to print, it goes to print-center and partially sends the document to the printer. To complete printing, without restarting, I have to unplug the printer from USB, then plug it back in and it prints fine. Also, Epson Scan no longer works with my Epson RX500, simply says that no scanner is present. However, the newest version of VueScan works just fine.