There's also something wrong with attachments.
There is an "Upload Attachments" and "Upload from URL" button beneath the reply box. That works. But, if I click "insert" and choose "fullsize," I get an error when trying to post the message, saying "please upload at least one photo."
It's strange because I can preview the post. The inserted photo looks fine. But, trying to "post reply" results in that error message. (I got around it somehow last night. But, it wouldn't let me post a photo this morning. I had to post the reply with the photo as an attachment at the bottom of the post.).
FWIW: It's confusing that I can upload photos as attachments, and insert them into the post (the way you'd expect a photo to be provided). But, if I click the camera icon to "share photos" I get another set of upload buttons. There's no feature to put those photos inline. They seem more like attachments.