I just started setting up my Careers profile, and got really confused when, after returning from adding books, it appeared to have forgotten all about my education, relocation, and other details. I added some of these again before it occurred to me to reload the page, and lo, there they were.
This was really confusing for me. I realize this sort of thing has been brought up under [ Why is page state not preserved when using browser Back and Forward buttons? ] but that's for the questions page, where going forward and back is kind of a weird behaviour and where vote counts aren't that important. For the Careers page, leaving the page is part of the design, and it's really upsetting/discouraging to have everything suddenly be gone.