This keeps cropping up, I'm hoping to find a pattern. I don't think it's a bug, but not certain what it is yet. Can you please submit a ticket for my attention with an Admin login?
A number of template errors were being generated which were preventing the templater from executing certain functions.
These errors were coming from an incomplete install of Siropu Ads Manager. I've removed that add-on from the server entirely as it would not install fully. It was reporting that one of the widget classes was missing.
You will need to report that to the developer of the add-on and get a fixed version before attempting to install the add-on again.