For people who are getting pop in and aliasing with the PSN version, try this: (repost from the small digital download version thread)
Obviously, I will not be able to replicate the old conditions on my hard drive, so it is unclear what deleting save files, game data and games actually does (but it was necessary: just doing the recovery options, which I tried separately, did not resolve the issues for me).
I should point out that all the pop in I have experienced and the improvement with this fix
have been tested by me only in open world mode, right when you get control of Franklin after the initial forced mission.