Thanks, Bob. There wasn’t a “Media Cache” in the Common folder. So I searched for it in Finder and found a Media Cache folder; however, there were only two files in it.
I’ve worked on Macs for about 12 years now, and just started working in Ae within the last two years. Do you know if the Adobe CC programs look the same, and are the key commands the same on PC as they are on a Mac? I’m a little hesitant to switch, but I may need to.