Ended up being Shortcodes Ultimate.
Plugin Author
Tubal
(@tubal)
Glad to hear that! It was really weird.
I am having the same problem but am not using Shortcodes Ultimate. You can see what is happening on a new client install at sportafence.com on the home page. I am leaving the error in place until you have a chance to see the problem. I have to get it down ASAP though since this is a live site. Your immediate attention to this problem would be highly appreciated. Thank you.
Same issue on a few of my sites.