My modem is hooked up to an airport extreme base station. I've a macbook air and an iMac connected to it via the 2.4ghz N mode. Prior to the 10.5.3 update, I was able to browse and screen share via the 2 macs. After the update, I could see the Macs on the finder sidebar, but experience problems connecting to it, either to share files or to screen share. I cannot even see either macs showing up on iTunes anymore. None of the settings on the Macs/Aiport Extreme base station has been changed before and after the software update. Is this problem due entirely to the update or is there something I could do on my side? Would appreciate any advice I could get, thanks guys.