This evening, while I was reading a PM, I was called on the phone. When I came back, the system had 'logged me out' automatically.
No problem normally, just sign in again (I thought). Upon signing in, the system put me straight back in the PM area.
However, when I wanted to go browse the Forums, there was no button or link whatsoever available to click on, to bring me to those forums.
I had to open up another tab and click on my bookmark (favorite in IE) to get to the forums.
I also could only close the PM tab, as there was no logout from it either.