Yesterday Google mail was having conniption fits about "invalid cookies" in one of my machines (personal + business gmail). Trying to get to the settings page o

Yesterday Google mail was having conniption fits about "invalid cookies" in one of my machines (personal + business gmail). Trying to get to the settings page only led to the same error page advising clearing browser cache and cookies. Ended up having to clear all cookies - just the obviously googly ones didn't work first time.