My Gmail account was playing up, so I completely deleted my Google account from my Mac (i.e. didn't just deselect Mail, deleted the entire account). I also deleted the relevant entries in Keychain too. However, now when I try to add my Google account again, it won't let me do so. It asks me for the email address, then the password, then the box just goes grey and does nothing. Any ideas anyone? I've tried booting into safe mode and that made no difference.