Doesnt work with iPad, but does with iPhone

Im not sure how many stars to give it, since it works adequately (3-4) stars on my iPhone 6s Plus but simply doesnt work on my iPad Pro, the latter being the device on which I do most of my reading.
On the iPad, the app opens, and then I am left staring at two vertical pages formatted like the one I see when I open the app on the iPhone, but with no text. I wait and wait, and no news.
To read on the iPad, I get around the problem, I use a browser link to the home page. I can read the Washington Post on my Windows PC as well, again with a browser link.
Yes, I faithfully install each update, test the app and ... No change. Im also running the latest version of iOS on both devices. Heck if I can make any sense of this.

Subscriber in Germany about Washington Post Select, v1.6.0