error using From To date filtering

Hi andrea. Thanks for your answer.
I upgrade yestrday using the complete instsllation package. Then i enter config settings and save.
I realized that the event mode never stays ON. When i save it putit off.
I edit the php config file setting event to 1, but it didnt work too.
What am I doing wrong?
The articles have the same creation and start publish sate, and dont have end publish date.
The error is always the same: the start date must be greater or equal than today.

Thanks