Here is an odd problem,
I work in an IT department on a college campus and we have had an influx of MacBooks come into the office and they are having problems connecting to our wired and wireless network. Not all of them have had the problem though. Right now one of them in the office is having the problem while another one doesn't. The only difference we seem to see is that the one that does not work is running 10.4.7 and the other one is running 10.4.6. The system runs fine off of a wireless connection but not when it is connected to the ethernet port. We have connected the one that is not working on our network to a straight DSL router and it works fine. So there is something with our network on cisco stuff.
If anyone has any idea on how to fix this problem it would be greatly appreciated.