I could not post reviews either. Namely when I logged in here first then used the search function to find a story and then clicked on the "review it" link. In that case clicking on these links always leads me to a one pixel image and the URL contains the word "avatar".

However I can post reviews if I click on the "review it" link while not logged in, then open the log-in link on the review page in a new tab, log-in, switch back to the review tab, and finally refresh the review tab.

There seems to be a bug in the code, just sayin'