Macbook Pro no longer connects to my closed WPA2 secured airport express

i setup my airport express to not broadcast its SSID, and everything worked perfectly for a few weeks, but now twice in as many days i've woken my computer from sleep and it hasn't connected, even after trying to manually enter my SSID and password, it cannot connect. I tried logging into the airport express through airport admin utility and its IP address, but i got an error that said it coudln't read the configuration of the airport express...
any ideas?

Ted,
OK, you do mention that you have deleted all Keychain items. Let's make sure you are deleting the right stuff. Right now, open System Preferences>Network. Choose "Airport" in the "Show:" menu, and then verify that the "By default, join:" menu reads "Preferred networks." If not, make it so.
Now, you will see a list of your "preferred" networks in this pane. If you are having problems, it can be very helpful to give this list a visit. Consider at this point if it wold be helpful to just delete everything in this list a start it again. At the very least, I recommend you delete any items related to your home (airport express) network. Use the minus sign to remove items.
While you are here, change the "Show:" menu to "Network Port Configurations." Make sure that Airport is at the top of this list (you can just drag items up and down in this list).
Now connect to your network again. It should all work seamlessly now. I have noticed that from time to time my MBP will lose my network (also no broadcast) when it goes to sleep. When this occurs, I simply turn Airport off, then back on again. It picks up my network immediately.
Scott

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