Originally Posted by Tuna

Doesn't happen to me when I use https, although after posting the forum takes me back to the http port.

I think the issue is likely in part due to the https implementation.

That or the servers are experiencing unusually high traffic that is causing the session to time out for posting. Of course it's harder to diagnose as a user.

If I have some time I'll do a more in depth investigation and post my findings here.