here is an updated copy of the Configuration/ServerBehaviors/PHP_mySQL/DataAssist/WADA_RelationalTable_block1.edml file that should correct the errors on reinspecting the MRT Behavior. you will need to locate the users configuration folder, for help locating the configuration folder, see the common installation issues PDF:
common_installation_issues.pdf
then copy the updated file to:
Configuration/ServerBehaviors/PHP_mySQL/DataAssist/WADA_RelationalTable_block1.edml
As for problems with the MRT behavior not working, please send a copy of your insert and update update pages so I can see how it has been configured.