I've found that if I arrive at at a thread here via Google or some other search, and login while on a page I want to bookmark or comment upon, I never wind up at the same place after login. Usually just the home page.
I've gotten in the practice of copying the URL from the address bar in safari before logging in for that reason.
Furthermore, it seems extremely random how long you stay logged in. Sometimes it seems it's barely an hour before I'm logged off, other times I'm still logged in several hours later. Anything that determines that? It seems like one has to keep at least a tab open while logged in to "prolong" it.
Where can feedback be sent about these issues? Surely the standard apple.com/feedback page is not the place?