This turned out to be some sort of conflict with W3 Total Cache. I disabled most of my plugins and slowly re-enabled, clearing cache in between. Messed with Minify settings and it started working again. I can’t say exactly what fixed it but it definitely was an issue with this plugin. Luckily, I got both to work together so I can still get the speed benefits.
Thanks for posting this, this fixed the same problem I had when upgrading to 2.8. The edit posts page came up but none of the posts did. Kudos!
