You need to as I have posted a few times download the source code from the members area and reupload all new files except the config files. I cant be sure you have not altered your files etc.
Using a default reviewpost I dont get the behavior you meantion which is why you need to replace your files as I have stated not from your backups but from clean source code. Here is a direct example that there is not a code issue with the program.
http://www.reeftalk.com/reviews/index.php
You need to send us ftp access and admin login to the application. To date we have recieved no such information to be able to login to your server or application so we can not help you in any manner until this information is sent.
All I can state without any answers to my questions and further access is look at your site say yep it doesnt work and you need to upload clean files.