I have the same problem here,
Here’s the spec:
– mysql Ver 15.1 Distrib 5.5.47-MariaDB, for Linux (x86_64) using readline 5.1
– Apache 2.4.6
– CentOS 7.2
I also run another server on Nginx 1.10.xx had the same issue
Actually all issue had been resolved by repair plugin, but I think WordPress team should know about this.
here is my maridb.log on my Apache server
[code moderated - follow the forum guidelines for posting code - http://codex.wordpress.org/Forum_Welcome#Posting_Code - and use the http://pastebin.com/%5D
