Is my xsp render engine bugged?

We have recently encountered a problem while creating an application with xsp render engine. It causes a ripple effect wherein the newly created application causes further errors. The error message shows:
“com.ibm.designer.domino.xsp.internal.events.simpleactions.uimodel.SimpleActionElement incompatible with com.ibm.designer.domino.xsp.internal.events.simpleactions.uimodel.SimpleActionElementRoot”
I did a little bit of tinkering and I managed to remove in the beforepageload event an execute script, which managed to stop the errors. However, when I start a specific control of the said script the above mentioned error reappears. Can anyone help me manage a way through this? I really need some help.
