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Disable Next Button on a Slide until all Buttons are Visited
This example illustrates how to disable next button when the timeline starts and enable next button when a variable change occurs after all of the slide buttons/objects have a state change to visite...
"When states is" can be flakey. Among other things, in the past it was documented not to be able to handle more than four objects whose states were checked. I don't know if that has ever been remedied, but there are other problems with it, too. If there is a listener for states changing, it is very low priority or/and only listens sporadically. Variables actually are very reliable.
