Not sure if this has been mentioned, but when I click the number on my watchlist to send me to the first post I haven't seen, it's as if I can't hit ii and it sends me to the first post. Then my "bookmark" is lost so I have to sort through pages. Sometimes it works, sometimes it doesn't. Maybe make the footprint of the number box a little bigger so we don't have to be so precise? I'm not sure if that's the problem or not.
*it's also a problem on the main thread list.
There's also a little plus sign in the bottom right of the reply box
On the iPhone 5s