I was signed in but it told me I wasnt? O.o
I suggest that you log out, go to your browser and clear your cache and cookies. (Usually under the tool options). That should get rid of the "bug". If that still doesn't work, mail one of the administrators to help you out.
Anytime the site is in transition, there may be some issues with posting. We apologize for the inconvenience.
It's just a bug, many changes are being made on FA.