what does the orange line mean?

[uh doh bee]

I only have 2 sound sources and 1 video source going on this 3-minute YouTube video I'm making, but the orange line appears, and my song keeps jamming/stopping!

why does Adobe Premiere Elements 2019 have room for 3-4 videos and 3-4 audio/sounds when the presence of the orange line seems to be a warning that this program can't even handle half of that? 

[Steve Grisetti · Accepted solution]

As I show you in my books, the yellow-orange line along the top of the timeline indicates a need to render the timeline in order to get smoother playback. This is necessary if you are using an unusual video source or you have added effects or adjustments.

To render the timeline, press the Enter key on your keyboard. The yellow-orange line will turn green and your video will play smoothly.