On my dad's work laptop, I get signed off almost every time I post, even if i'm set to be logged in forever. Laptop's an HP that runs Windows 7 and the only browser I can use on it is Internet Exploder.
Edit: Quick editing doesn't sign me out.
Edit 2: Regular editing signs me out. I think it's only if I have to change the page in relation to posting.
Also, another problem: While editing (not quick editing) and making posts, pressing enter once looks like a double space, but it's actually not. Not a big problem, just something I'd like to mention.