Whoops! I broke the theme thumbnail rendering. Here is the error message when I try to copy an existing theme
I actually know what the problem is. I was trying to use the footer mako template to give me a different footer depending on the songbook. The usecase is to manage liturgy in the songs database, rather than as custom slides. In order to do this I want the footer section to actually act as just a single line title. I have changed my footer template like this.
entries = ", ".join(songbook_entries)
%if entries == 'Liturgy':
%if alternate_title =='Blank':
Standard footer here
This seems to work well, except for the fact it breaks the theme thumbnail rendering, which is probably understandable. I have the obvious work around, which is to put default template back whenever I want to change a theme, but I'm wondering if there is some other way of writing my template that would make this unnecessary. By the way, I think the configurable footer is fantastic! Thanks.