Hmm. If you zoom in on the x-axis, do more bars show up? I'm trying to determine if the data is being displayed poorly, or is not being populated properly. Is it only a problem when you zoom out to such a large timespan? You might also try clicking the blue window button to swap the chart and calendar, giving you a significantly larger chart to look at. Still get the same result then?
(My bad, the images were posted correctly. My firewall was blocking them