The course team for course-v1:HarvardX+HUM2x+2T2016 has noticed that it has taken up to 5 days for new content to appear in the Android app. We have a hard time reproducing as we do not have a test phone or as of now able to run the Android simulation.
I've attached a few screenshots that have been provided by the course team. The subsection Optional Extras: Hour 6 in the Hour 6 section was added on 9/7 at 13:03 UTC and can be seen on the website and the browser view on Android. However, when using the app, the content still hadn't appeared by 16:11 UTC.
Similarly the units within the Optional Extras: Hour 5 subsection fail to appear in the app, but are visible in the browser.
Do you know what is going on? What other information do you need?