TypeError: self.iframe.$container.dialog is not a function in parent.js

With the latest model frame (in conjunction with Node Relationships) I came across this bug in the parent.js script.

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[09:10:09.875] TypeError: self.iframe.$container.dialog is not a function @ http://www.cinemapolitica.org/sites/all/modules/contrib/modalframe/js/parent.js?7:294

Basically, it is causing the node relationships (buttons for editing/adding new content within another content type) to not properly. It reports the error above.

I'm not sure what has changed from previous versions but this only just happened recently actually since the latest upgrade. For the last year there hasn't been any problems??