Timeline does not start Automatically in Preview

Hi,

I have been working on a course using Articulate Storyline for a few weeks now. Up until a few days ago when I previewed it, the timeline started automatically as the user clicked next. Now in preview I have to click play for the slide timeline to start.

For instance, I have a slide where my two characters ask a question and give an answer. The question caption is on the timeline for 5 seconds, then it should disappear and then answer caption comes on the screen from 5 second until 10 seconds. When I go to preview the slide does not start on its own. I have to click play for any animation or timed text to work.

How do I get the information to start automatically when the user advances to the slide? I didn't give this issue last week. Is there a setting that I might have accidentally changed or need to play with?

Thanks!

Lisa