I am only getting summaries. I can even see the article load but quickly disappear.

Was this resolved for you when you uninstalled and reinstalled the app ?

No that did not help unfortunately 

This is a network issue as the summaries and articles seem to come from two different servers. My network blocks untrusted domains.

I will have to look at what is being blocked

It seems that the articles are being served by ad servers, or the ad server must first connect for the article to follow.