When I view a "wide" thread (not sure why, maybe related to having large images on the page), the page is no longer resized horizontally like it used to be, so text runs off the side of the screen. See the latest page of the minis thread for an example. If you don't see it right away let me know and I'll add a screenshot.
Also the "Insert Hyperlink" button doesn't work as expected if you don't prefix the URL with the protocol 😉 No idea if that's new or not.