This is my first attempt at using After Effects so bear with me:
I'm trying to edit a set of titles made in Premiere in After Effects, and after I import the file (as a Premiere file) then load the sequence into the timeline; the preview is just a black screen throughout the entire preview. The titles never show up.
Premiere Pro titles are not among the things that are converted to After Effects elements when you copy and paste between the two applications or open a Premiere Pro project in After Effects
See the tables at the bottom of this page of After Effects Help: