I've been using the GNOME To Do app on Ubuntu for a while now on several machines, and it worked without much effort.
However, recently I noticed that changes are not synced anymore. If I make a change in google calendar (add or move a task), it does not get added or moved in the To Do app. Vice versa: when I add or move a task to a later date in the To Do app, it does not update in google calendar. Also: when I reboot, the changes made in the To Do app appear to be gone.
I've tried looking for a manual update button in the app, but couldn't find it.
Anyone have any clues what might cause this?