Recently Adobe installed an update and when I went into my After Effects project – the display timeline had changed to frames. I was working on a new intro that was only 7-10 seconds long and it was easier to add/remove parts by using second markers. As I’m somewhat new to After Effects, I did what most techies do – I googled how to change this back. I found several people were asking the same question and I looked at many posts about how to fix this and none of them worked for me.
Here’s a video I made on how I fixed this for my scenario. The short intro in this video was actually the original project I was trying to create when this frames to seconds problem happened.