Link not working to another file/unit
I have developed a course with 11 units. At the end of each unit, the user is asked to click a button to open the next unit. All units open great, except for one. When I test the link from unit 1 to unit 2, it just redisplays unit 1. I've verified that I have specified the correct file to open. I've replaced the button and re-established the link from that button to unit 2. I've checked project settings, slide settings, etc. I've confirmed that it's not set to loop and replay itself. What am I missing?
Thanks!
SAM