No Internet Connection in some locations

Greetings all, and thanks in advance for the help...
I have a MBP 13", running 10.7.4. In most locations, the wi-fi works fine. In certain locations, though, I cannot pick up a connection even when all other devices in the area (wife's MB, iPads, PC's, etc.) can. For example, it consistently works in my office and at home, but I cannot get a connection at my in-laws' house. There are certain public hotspots where I see other people with Macs working online, but I cannot get a connection. In all cases, I will see the network, but it will show the '!' and the menu will read: Alert: No Internet Connection. If I access the connection in Networks, it does not pull an IP address. If I renew DHCP lease, it will still not pull an IP. If I connect to the router with an Ethernet cable, it works fine.
I've looked through many threads here, and have tried the following:
I have powered down and reset the MBP, router and modem.
I have confirmed that the router is not using anything higher than 10 (currently 9 for example).
I have connected manually, taken the IP address that is assigned and works (i.e. 192.168.0.7) and entered that as a manual address for the wi-fi connection.
I have run System Update and installed any updates necessary.
I have created a new location and tried that as well as using the Automatic setting.
I have burned fresh incense and been very cautious to only wave the smoke around the computer in a clockwise direction, never counter-clockwise.
It's maddening to not know at any given location whether or not you'll be able to connect there, and I know that if I take it into an Apple Store, they'll tell me "Well, it works in here, so it must be your router." Again, if it were only one location that consistenly didn't work, I'd be inclined to believe them, but the fact that a) other devices (including ones using Lion) work in these locations and b) it's multiple spots that consistently don't work tell me that there's something system-oriented happening here.
Any thoughts are much appreciated!
Many thanks.

I am having the same problem. It depends on where I am.
If I'm at home connected to my Netgear wifi connection, everything works fine. Some days into down to the coffee shop in my building and I get the no Internet connection warning, but others are connected.
I have to ask the coffee shop folks to reset their wifi router, and then I get the connection.
I am not sure what the disconnect is between the coffee shop router and my MacBook, but I'd much rather prefer to find a solution to reset my wifi card so it works, then having to ask the coffee shop barista to reset the router every time I have this happen.

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