Some schedule reports blank after 11300 upgrade

Hello,

I upgraded opmanager during September into build 11300

first day of each month I have several schedule reports for Windows services availability of 9 business views.

This month... blank .xls files for each reports.

Strange thing is that other schedule reports (performance reposts for CPU, Memory, server availability...) are correct.

I tried to generate on demand reports for one server for windows service availability and I got the "No data available" pop up... But if I click on the service monitor, I can see the availability for the past 3 months, as usual .

Any help will be very welcome :)

Thanks a lot