My understanding of the tutorial.rst example is that the LEGO hovercraft image should be the background image on all pages due to the ..header and ..image directives. I can see that the image is being accessed by looking at the server log output, but upon investigation, it looks like the image is used in several places through the presentation. I changed the header/import line to reference a different png file in the same location and I don't see that new filename being accessed when doing a full reload of the presentation.
Sorry. My bad. Turns out the version of hovercraft! installed from the apt repo on ubuntu is 2.1. Installing a more modern version from git did the right thing.
My understanding of the tutorial.rst example is that the LEGO hovercraft image should be the background image on all pages due to the ..header and ..image directives. I can see that the image is being accessed by looking at the server log output, but upon investigation, it looks like the image is used in several places through the presentation. I changed the header/import line to reference a different png file in the same location and I don't see that new filename being accessed when doing a full reload of the presentation.