I just figured it out. I was “building” the caution tape across the screen – one stripe, then a few frames later the next, and so on, up to 12 stripes, each stripe being a separate ai file. Well, my 12 file for some reason isn’t showing the stripes, so when 11 ended, which happened to be the same frame that the psd file came in, the stripes dissappeared.
I’m still not sure why the 12 file doesn’t have the stripes (when I look at that layer is it just black), because when I open it in AI it does, but I think I can figure it out from here, and it will be easier then delving into my 3D layers when that obviously wasn’t the problem.
Thank you both for your help, and I’m sorry if I wasted your time since this problem isn’t what I thought it was at all.