I've just had the experience of being told I need to login to post, but the screen keeps showing me as needing to login after the attempt to login.
On the other hand I found that I was on the list of those watching the forum, could examine my profile.
I attempted to register again (changed username), and was then again in a state where I could view my profile.
When I logged out at this (profile) screen and then logged in, it then accepted I was logged in.
How can one complain about this sort of anomaly without being able to login?