Google sign in issue

[Warped]

Have you tried using different browser when signing in? Have you deleted cookies as you enabled them?

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Sync error: Sign in again

Your sign-in information is outdated (e.g. you recently changed your password or turned on 2-step verification for your Google Account).

If you have changed your Google Account password, follow the steps below:

1.Click the error message and enter your Google Account username and the new password.

2.If prompted for a passphrase, enter your sync passphrase. In some cases it may be the same as your Google Account password.
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If you have enabled 2-step verification, follow the steps below:

1. Click the error for exact details.

2. If you're prompted to sign in, enter your Google Account username and password. Do not enter an application-specific password here.

3. You will be asked to enter a verification code. Generate the password on your Authorizing applications and sites page and paste it into the dialog.

Source: Troubleshoot sync issues

Edit: I'm not certain it would help you, I've never had a problem like this, but as it's somehow related to your problem it should be tried.