What is your OS?
What version of DW are you using?
What version of MySQLi is installed? the most recent version is 1.0.3.
if you have a previous version installed, please uninstall it fro the extension manager before installing the newer one.
also, it may be that you have an older version of the webassist/mysqli/rsobj.php file in your site.
try deleting that file both on your local and remote server, when you edit the recordset, it will regenerate it.