So, something changed. I guess new version of forum SW?
See log out button gone?.
Minor annoyance but something I hate also in real life web site behavior, change as change is progress and no change is standstill? But moving buttons around or changing name to icon or such stuff is just … imho (do not take this too serious 
).
Another thing I noticed is that the buttons in the hamburger menu (Latest, Unread, Badges and so on) inside the native browser in SFOS 3.2 do not work anymore. But only in landscape orientation, in portrait they work as usual!??
The newer browser in SFOS 3.4 does not show this behavior!