Do you also know the problem that you want to sign in to Google services like Google Reader or Mail but the page just keeps refreshing? Have you also enabled cookies and use a supported browser, etc, but it didn't help? Try this...
It turns out the fix is often very easy. I've confirmed this to be working for me: Just use the U.S. domain ending in .com of the Google service instead of your local ".de", ".com.au" or other domain. E.g. www.google.com/reader instead of www.google.de/reader.
Login should work fine right away now. Let me know if this works for you! Thanks goes to this post in the Google forums. Interesting that Google hasn't noticed and fixed this bug yet.
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