After a conversion from Mx4 to Mx6 I sometimes get suddenly the error below in firebug. In the modeler I get the standard message From firebug I see this error below in my console, but that does not help me much. Anybody a suggestion on how to find the real culprit? Strange part is that I open this form multiple times without a problem and then suddenly the form does not work anymore. Regards, Ronald [EDIT] Strange also that restarting the modeler does not help. Restarting my laptop does help and the form becomes available again. Very strange, wonder what triggers this. 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