I can't believe the timing!! Just received your newsletter about having to unregister the EventTriggerBehavior and only yesterday after spending hours I was about to log a long post on stackoverflow.com as I was faced with this problems where events were triggered multiple times after my behaviors library was updated from 8.1 to the uwp. It droved me nuts as my app was working perfectly well until this upgrade occurred. Decided not to post question just yet as I started spotting other new issues. Only wish your newsletter was published a couple of days sooner as I've now removed the event behavior from the various places it was used in. Thanks for sharing as always!

A case of bad luck, I guess!
The bug was fixed quite some time ago, but they only pushed an updated package yesterday, hence why I didn't publish on it before! My advice to you for next time is to start by checking the reported Issues in GitHub and see if someone has provided a fix! :)

Indeed, it was. As for checking github, I definitely will. Thanks