This am I could not find thread #110 & then it was back. The blue button was there however only showed thread#109. Now the wiki and the blue button are gone.logged out and in and still not there ... it disappeared on me the other day too, so hopefully it will come back soon.
I also found it hard to find at first, until I found the pink button under the title at the top of each page. I'm in dark mode, so probably why mine is pink, not sure what the regular colour is. That's the best access to it!
Maybe it’s a Canadian thing!