I've my Google account synced and the calendar works fine. But not always: concretly, if I reboot my computer and log-in in my system before Network Manager has connected to the Internet, the integrated calendar doesn't show my appointments (I must see them througout Evolution). I know no way to force the integrated calendar retry the synchronization once logged in. Neither logging out and logging in, nor rebooting, makes gnome-shell work.
The only way to make the integrated calendar work is rebooting and, in the gdm/lightdm screen, wait until Network Manager has connected before log-in in my system.
What's the problem?