It looks like the problem is the timeline. As far as I can see the time header doesn't include any cells.
You can check whether this is a display-only issue by checking dps.itline array in the console. It's an array that defines the timeline. If it's empty it means there is a problem with the definition (e.g. days == 0). It it contains valid items there is a problem with the view (CSS, possibly).
For view issues you can try updating the theme (copy it from the latest release or create a new one using the theme builder at http://themes.daypilot.org) .