Same for me. After automatic update everything was broken. The Update Database Button appears, after that update the site works, but half of the content disappeared. I reverted with complete restore to 4.4.12 and dont see a way to update to ACF 5 without completely rewriting our site, which I wont do. If support will have a look to this error, I can give you credentials, full updates which are capable of doing a restore to a healthy situation are available.
