Now, you can't post in the shoutbox without login. Simple enough, no real biggie. However, once you login, the site still don't say your login (if your on the forum) until you refresh the page. This happens to me on, firefox, and IE. =P Something I think should be look into...
As far as I can remember, as long as I have been playing one has not been able to post either in forums or in shoutbox without being logged in.
With regard to the switching to not logged in. Yes this seems to be an intermittent problem. It does not happen too often with me though. It usually happens to me when I have been logged in for a while and then refresh a page and at that point switches to not logged in. I just completely close the browser and then go back in on these occasions.
I used to use internet explorer for the site. Now recently I have gone over to Google Chrome, just for this site and apart from speed of refresh of pages being much faster, I tend to have less issues otherwise. Interestingly enough I did get the log in issue only just yesterday though
However I used to get it more frequently with internet explorer and I put it down to a glitch in browser connection when trying to refresh a page. Or it could be a site issue, I am not sure?