Action Stops Working

We are currently using Lectora 2005 and have encountered a problem that Hopefully someone can help with. We have an action built at the title level that allows the student to press the Enter key to advance to the next page instead of using the "next" button. This works fine until the student opens a pop-up window. When the pop-up is closed the Enter key cannot be used to advance to the next page. The student has to use the "next" button. Once the page has been advanced the action works fine until another pop-up window is opened. Any ideas why?

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