The Mystery of the Disappearing Content
That’s the general nature of these bugs. Except the PublishEmptyItems bug can cause entire sites to disappear. Happened to me. 2 hours of downtime. Was going crazy trying to inspect every single line of my configuration files, restoring DBs, and going through logs.
The new Sitecore v7.2 has a lot of great features and I personally recommend upgrading after a thorough QA test to make sure things run smoothly, but it wouldn’t be “software” if it didn’t cause your site to sink into a pothole once in a while. That’s the nature of the beast.