Sorry if this has been discussed else where. I spent about an hour searching and couldn't find anything exactly referencing my problem. If there is one, please point me in that direction. Thanks!
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I have a multisite that I've been running for the annual conferences of an organization for 3 years now. There are currently 4 sites: the main site (just a blank site, no content), the 2013 conference site, the 2014 conference site, and the 2015 conference site. Up until yesterday everything was working great. Suddenly today the 2015 Conferences Site started pulling up 404s for every page. I've spent the last 6 hours running through all the typical hack finds and fixes but nothing worked. When I looked at the database though I discovered what I think is the problem.
When I set the 2015 site up back in Sept '14 it was writing to and reading from the tables with the prefix wp_4_ in the mySQL database. Now, it doesn't seem to be connected to those tables at all. None of the posts, pages, or media are showing up at all in the 2015 dashboard, but all the data is still in the wp_4_ tables--so I know the data/content is there. I've tried using permalinks to get to what should be existing pages, but all I'm getting is 404s. (http://sigdoc.acm.org/conference/2015/)
I tried putting up a new page with a message that the site is down and realized that even though I wrote it in the 2015 dashboard, the post showed up in both that dashboard as well as the main site dashboard. (http://sigdoc.acm.org/conference/blog/2015/05/22/testing-new-post/) When I looked at the database the data was saved in the wp_post table rather than the wp_4_post table.
Any ideas where/how these pointers got changed and how I can change them back? The 2013 and 2014 conference sites are working just fine (and the 2014 conference uses the same theme as 2015, so I know it's not a theme issue).
Thanks for any tips and suggestions.