You have to use a series.json file, add the json file to a story arc folder.

Search for "series.json" on this thread, you should find Scott's reply regarding this.

The switch back to png fixed it! thanks.

Tested and working on XS Max (12.1.4) and 6S Plus (12.1.4), both of them had issues with the previous svg releases.

Tried the latest release, still the same. Thought it might be my reverse proxy but nope! it's the same on local url as well, it worked fine before the banner changes.

Scott, the logo doesn't load on mobile (iPhone). I've checked on two different phones.

works fine mate, banners switch as expected depending on modules enabled.

I am :D  thanks.

That's a good idea.

I've got a few more suggestions if you want?

1. Swap the 'and' for an ampersand.
2. Slightly reduce the space between the main text and sub-text
3. And if the goal is to match the comixology logo, right align the the subtext. 
    

In my case, removing the following header, solved this issue for me:

add_header X-Content-Type-Options nosniff;

I see, thanks for looking into that. IMO a lower case 'c' would look better there.

I like these, could you please post a version of the 2nd one, with the sub-text 'Comic and ebook server' font size reduced, similar to how it's on Comixology?