I am having a similar issue on lunarpages.
It started (I think) when I was editing a page and my internet connection went down. WordPress said it was saving the page in my browser — I think this is a new autosave / post locking feature. Now I get 500 errors when trying to view the site and while I can click on settings in the Wp-admin area, I can’t click on pages (it just never finishes loading, though the left nav is still there) or portfolio. This applies just to my development site; the live site, still on 3.7 and in the same server environment, is unaffected.
We are launching this site tomorrow so I will be rolling back to 3.7.* to get through it.
If anyone has any insight, please share.
Best Regards,
Lucinda
