A user is reporting an issue after upgrading to Joomla 1.5.15. I believe that it is to do with changes to the WYSIWYG editor. If you are unable to save reviews after upgrading please respond in this thread. I am unable to reproduce the issue on a fresh installation of Joomla 1.5.15, but it does seem to be a known issue with some components. In the meantime please try some of the suggestions or try turning the Joomla ‘Default WYSIWYG Editor’ to no editor.