Solved:
Campus Life - Gallery | NSP GK5 was the culprit.
I assume it was pulling articles that didn't exist.
For Gavick: I'd probably fix this before the next quickstart release. Make sure nothing is checked out and maybe provide real demo articles to be pulled through that NSP.
For everyone else: You'll have to Global-Check In that NSP as it's checked out by "Saul Bellow" and either disable that module or populate it with real content.
Why this issue prompted once I installed JomSocial I don't know.