App Store login sheet not showing

Question

I upgraded my MacBook to Mac OS X 10.6.5 to 10.6.6. Upon restarting, I opened the App Store and clicked sign in under the Store menu. Nothing showed up. I clicked on the item several more times, and then I looked in Console. Two error messages were present and are as follows:
1/6/11 5:45:59 PM App Store[255] Could not connect the action createNewAccount: to target of class CKSignInPrompt
1/6/11 5:45:59 PM App Store[255] NSConcreteMutableAttributedString initWithString:: nil value
Thanks,
AppleMacintosh

Answer 1

Thanks for the reply David. No I don't run software like FruitMenu. Despite the developer's claims to the contrary, I've seen it interfere with standard Mac Apps.
The solution for me is shown in this thread <http://discussions.apple.com/thread.jspa?messageID=12879665&#12879665>.
Basically, you download the full 10.6.6 update, unpackage it, delete the CommerceKit.framework on your machine via "sudo rm -fr /System/Library/PrivateFrameworks/CommerceKit*" ( without the quotes ) and then copy the unpackaged version to your system folder via: "sudo cp -R ~/Desktop/MacOSXUpd10.6.6/System/Library/PrivateFrameworks/CommerceKit.framewor k /System/Library/PrivateFrameworks/
The complete 12 step process is provided by NSFW80303 ( thank you !) at that link. This is most likely to happen if you have the developer beta ( as I did ) of 10.6.6, used reversioner and then applied the 10.6.6 Software Update.