Currently Being ModeratedApr 28, 2012 5:54 PM (in response to Dj Crash)
Third party apps such as Growl and Little Snitch can prevent the sign in sheet from appearing.
If it's not a third party software issue, installling the OS X Lion Update 10.7.3 (Client Combo) reinstalls the App Store for you which may help.
Restart your Mac after the combo is installed. It's ok to do this even though you are already running v10.7.3.
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