I like Iris a lot but I've only been getting about half of my feed for a while now and my relay list doesn't load. I've tried Firefox + 2 forks and Ungoogled-Chromium. DM's and notifications work perfectly.
Discussion
Have you tried these:
https://docs.iris.to/support/troubleshooting#try-this-first
There has been some bug fixes and upgrades lately.
https://beta.iris.to has always the latest version if you want to test it out.