Wireles network menu sometimes shows available networks, often doesn't

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http://askubuntu.com – When I open my laptop, it often doesn't show the available networks. If I click on the icon in the Gnome panel, I only see this: What I should see is this: Fortunately, even though it usually doesn't show the available connections, it still connects to one of them, and I can I can use the internet. However, sometimes it doesn't, and when that happens, I have no way that I know of to select an available network, and that can be insanely frustrating. Sometimes, and I don't know what triggers it, after a while the menu will display all options, as I believe it should. But it doesn't seem t (HowTos)