We'll look at this and see if it's something we can fix easily, but a caveat: the RTE in that version of the update page is very old, held together with duct tape and baling wire with a little bit of spit for good measure, and sometimes breaks badly in modern browsers. (We're working on a newer version for our beta create entries page so we can get it out of beta, but haven't been able to finish it yet.) There's a chance we might not be able to fix the old version if it's a more complex problem. (It's still working in Firefox and Safari from what I've been told, and we didn't change anything that should have affected it, so there's a chance the timing was coincidental and it was actually a browser update that broke it.)
Re: Did the Rich Text editor go away?
We'll look at this and see if it's something we can fix easily, but a caveat: the RTE in that version of the update page is very old, held together with duct tape and baling wire with a little bit of spit for good measure, and sometimes breaks badly in modern browsers. (We're working on a newer version for our beta create entries page so we can get it out of beta, but haven't been able to finish it yet.) There's a chance we might not be able to fix the old version if it's a more complex problem. (It's still working in Firefox and Safari from what I've been told, and we didn't change anything that should have affected it, so there's a chance the timing was coincidental and it was actually a browser update that broke it.)