When testing this, please keep in mind that when you're on the split login page what you see depends on whether you have an item in shopping cart with dollar value or not. Add a free item to shopping cart versus an item that have dollar value also affects the type of login page that is displayed.
Currently, googlecheckout does not display the button on the login page if there is no dollar value in the shopping cart when split login page is enabled (even if a free item that requires shipping is added). If split login page is not enabled, then googlecheckout button is displayed but greyed out.
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