As crazy as this might sound... you might already BE logged in.

So, we've had several people ask "how do I post a new classified" etc. etc. and they find they are asked / requested to LOG IN. When they attempt to do so, it simply returns them to the same LOG IN screen they came from.

THIS CAN BE RESOLVED EASILY by logging OUT and then when you LOG back IN you should be forwarded to the desired destination.

I can't explain why it seemingly works this way, but I've had the same trouble logging in (when requested to by the site, but I'm already (say) logged into another area on the site...)