I tried again and again over the course of the last week, but I can't seem to add pictures to posts anymore. 
The tool will let me select an image to upload, then display it normally in the editing box where I can also add an alt-text, but as soon as I hit the "save"-button all that disappears, and it goes back to asking me to select an image for upload.

The problem persists for me even with all script- and add-blockers fully disabled. It's also the same for me whether I use chrome, firefox, or BRAVE.

I can select and upload thumbnail images for the post just fine, I just can't seem to add any within the post's text editor. It's a real pitty, because I got my hands on some nice PCBs last weekend, and some of the pictures I took turned out really great.

Let me know if you have the same problem. I'd also appreciate feedback from any members of the team whether this is a known issue.

Happy blogging!