Passing variable from Captivate 5.5 to Lectora X - problem

I'm trying to pass a user-defined variable from Captivate 5.5 to Lectora X and it doesn't seem to be working. I just want to let Lectora know when a Captivate movie is done so that I can have Lectora go to the next page.

I've set up a variable in Lectora called "PageDone" and I have a timer action that checks the variable every second and, if it is "true", Lectora goes to the next page.

In Captivate, on the last slide, on Exit it executes JavaScript: VARPageDone.set('true').

I've done the exact same thing with a Flash swf using flash.external.ExternalInterface.call("VarPageDone.set","true"); and that works perfectly.

I've looked at every post I could find that talked about passing variables from Captivate to Lectora and I can't figure out why this isn't working. Any help would be much appreciated.