1. Extremely rare for me. When it does, it happens after I read them, left (without logging off), and came back to the site.
2. I don't recall that ever happening to me.
I'm also running Firefox. Try clearing your cookies and cache and logging back in; that usually solves problems like these.
"I'm not gonna lie to you, Marge... Well, goodbye."
- Homer Simpson, The Simpsons
"Help me, help me, won't you? Sing me, sing me one last song." - Alkaline Trio (Help Me)
"Sometimes the questions are complicated and the answers are simple."
- Theodor Seuss Geisel, a.k.a. Dr. Seuss