When I hit ENTER to render the project - the whole thing just snaps to the end of the workspace and doesn't render anything. Why do you suppose it's doing that? : )
Might want to check your WAB (Work Area Bar). It can get dragged around and might have been virtually collapsed. Also, do you have a yellow, a red, or a green line above your Video Tracks in the Timeline? If it's green, you do not need to Render, so you will get no Render.
Take a look at this image. It's for PrE, but your Timeline will look similar.
Note green line for area that does not need Rendering, and red line for the area to Render.
Thank you Hunt - some lines are green and some are red - therein lies the conundrum. You're so helpful - thank you so much for responding!