There is no activity on my iCloud account, even though I am signed in on both my Mac and iPad:

I am sure that there is a problem to my iCloud account. There is no synchronisation between my Mac and IPad. Although I have several items ticked in the preferences box for iCloud, there is no sign that anything actually happens - calendars do not synchronise, there is no photo stream, there are no documents. When i go to iCloud online, the calendar has nothing in it, even though synchronisation is turned on, so nothing transfers to iCloud or to my iPad, even though iTunes tells me they are set to synch through iCloud. It is almost as if each machine is signed into a different icloud accounts!