I have not found any bugs yet. I am running 12 to 18 applications at once on a 1.8GHz G5, and have updated to 10.3.8 on 2 internal drive and on 3 FireWire drives. I downloaded and used the combo update. All boot up flawlessly and behave as expected. I thought that I had a big problem when I could not get the computer to wake up from sleep several weeks ago or start up after shutting down. The update makes no difference. It turned out that the G5 is a little bit defective because it does not work within the specified temperature range; all I had to do to get it to wake up or start up was to warm it to 16 or 18 degrees C. The room temperature this winter dropped to about 4 degrees C at times. I had not noticed the problem earlier because I usually have the G5 running 24/7. George Harvey