I am having trouble accessing Duolingo itself (the skill trees), but not the stories or the discuss part (obviously). What should I try?
They are not directly aware of the issue as the backend / server works according to the uptime chart: https://status.duolingo.com
I have some doubts that they will fix it for older browser versions / hardware.
Quote: Someone please link me to the official announcements for this malfunction.
Your are already reading in the most up-to-date Troubleshooting thread.
I sent in a bug report and will keep you updated if there is any response from staff: https://forum.duolingo.com/comment/36389874?comment_id=36390008