It seems to be somewhat random but usually the first article in a section is dropped (often more). This started about a week ago. I suspect they've changed something on the website and I'm not the only one experiencing this issue but I don't have the technical knowledge to figure it out.
Today I have all 4 articles in the Front Section.
In the U.S. section (
http://www.wsj.com/itp/20150414/us/us) I have only 5 of the 10 articles and the first one is missing.
In the World section (
http://www.wsj.com/itp/20150414/us/world) I have 9 of the 12 articles with the first one among the missing.
The Greater New York section has all 16 articles downloaded.
The Business & Tech section (
http://www.wsj.com/itp/20150414/us/businessandtech) is missing 4-5 articles included the first one out of about 20.
In the Money & Investing section (
http://www.wsj.com/itp/20150414/us/moneyandinvesting) I'm missing 4 articles including the first out of 15.