Issue with schedule on a rule

Hi,

I have a rule defined to be accept only during a schedule:

All users from a specific clienteles group can have access to internet only during a scheduled period from 8:30 am until 11:00 pm

On daily basis, it doesn't work at 9:30 am, I have to go on the rule and click on save and after that it works.

I do change nothing just save and then it works.

Is it a known issue ?

How can I avoid to logon and do that each day.

I'm using the latest firmware.

Here is the schedule definition :

Here is the rule using that schedule:

Did I do something wrong ?

Thanks in advance