I am also having this issue and I am on a completely different operating system to those above. I am on Linux Mint 22 and using Firefox. All my software is up to date.  I am a web developer with twenty years experience and can assure you that this is a problem with the site.

It doesn't seem to happen in Chrome, but that is not the point - I don't want to be using that browser. At the moment, there are several actions that I cannot take in my preferred browser and am required to move over to my iPad to perform.

In addition to this, pictures don't show when you click on a thumbnail in messages, you just get an empty box.

I have noticed that there are several errors in my browser console when I open the page (see attached image).