Some Snow Leopard users have suffered from AirPort problems since 10.6 was released. In this client update, which requires 10.6.2, Apple says it has fixed three major bugs. First, it repairs some systems that, when upgraded from Leopard to Snow Leopard, could not turn AirPort on or off. Second, the update eliminates what Apple calls an "occasional" problem when using Wake on Demand, where network access would be unavailable. (Wake on Demand, new in Snow Leopard, lets a computer connected to an AirPort Extreme or Time Capsule base station be woken over either Ethernet or Wi-Fi for network access to advertised Bonjour services.) Finally, this update restores the capability to create software base station (look in the Sharing preference pane) or computer-to-computer networks to some MacBook, MacBook Pro, and Mac mini systems that previously had trouble.
Extract Directly from Time Machine
Normally you use Time Machine to restore lost data in a file like this: within the Time Machine interface, you go back to the time the file was not yet messed up, and you restore it to replace the file you have now.
You can also elect to keep both, but the restored file takes the name and place of the current one. So, if you have made changes since the backup took place that you would like to keep, they are lost, or you have to mess around a bit to merge changes, rename files, and trash the unwanted one.
As an alternative, you can browse the Time Machine backup volume directly in the Finder like any normal disk, navigate through the chronological backup hierarchy, and find the file which contains the lost content.
Once you've found it, you can open it and the current version of the file side-by-side, and copy information from Time Machine's version of the file into the current one, without losing any content you put in it since the backup was made.
AirPort Client Update 2009-002
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Special thanks to Geroen Zwaenepoel, Rick Bourne, Jim Ledvinka, and
Richard Morse for their generous support!
As a workaround I use the drop box feature now.
Could you describe your failure in a bit more detail? Is the AirPort loosing commection? Is the AirPort staying connected, but the file transfer stalls out?
If the transfer is just stalling out, you can try this command to see if it helps:
sudo sysctl -w net.inet.tcp.delayed_ack=0
It still stinks when you're one of the few with problems.