I got an email about a webinar series about HDF 3.1. I watched the first two parts and was trying to watch the 3rd but it will not play. https://hortonworks.com/webinar/series-hdf-3-1-technical-deep-dive-new-flow-management-features/
If you try to view it, after registering, it opens a suggested videos box and the WATCH button becomes "CLOSE FORM". I click "CLOSE FORM" and the button becomes WATCH again. Click WATCH and the suggested videos box drops down and the button becomes CLOSE FORM. Is part 3 available? Maybe it's offering suggestions because it isn't there. If it is available, can you either fix the page or provide an alternative link?
I've been able to reproduce your issue and have given the feedback to our team, will update when it is fixed