>>Is the system time & date correct on your machine?
>>
>Do you know why did it change? Setting the right year (BTW, had to scroll to 2010 - very inconvenient) seems to correct a problem with gmail.
>
>Testing other stuff now.

No clue as to what caused your date to change. Are you using a desktop or a laptop? Even desktops have a tiny battery in them and if it's no good then that will cause the date to reset.