Wild guess: you sure that little eye icon over to the left of the sequence is present for the video track that you have your titles on...? Happened to me once..
I've seen this several times, although usually when moving projects between different computers.
We usually fix it one of two ways.....
1) Double click the title, bring it in to the title editor. Makesome small change, change it back (not an undo, but manually put it back), then close the title editor
2) Simply move the title to another video track
Usually it requires the first one but occasionally the second one works.
What seems strange is that it plays fine in Pr but doesn't export until we do one of the above.
Thanks to both of you for taking a crack. Seemed to actually be the fact that I still had the title itself highlighted in the timeline..... Rookie mistake.
Wow! I didn't know about that one or the other problem/solution. Things to look out for! Thanks.