With Lion, Wi-fi does not connect automatically; have to manually connect. What has changed from S. Leopard?

I have to manually select the network I've used for years. Connection eventuallly made. Snow Leopard never had a problem connecting to the network automatically.
Restarts have not solved the problem.
Looking for suggestions.
Thanks.
Bob

I found a new way !
go to Applications
click Utilities
click Keychain Access
1- click log in on left side
choose your wi-fi connections
click access control
and click allow all applications to accesss this item.
2- click system under login at left side
then do the same things that i wrote above
now it should works well..
I tried and it works ..
Let me know ..

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