CC

Of course, I figure it out as soon as I post! It appears to be in postmeta.

@mikeg403 – You are right, rolling back the plugin does the trick. Thank you for that idea. However, I believe there is a security vulnerability in version 3.7 that was fixed in the update to 3.7.1, so it could be risky to keep the 3.7 plugin version. :-\

Having the same error (except I did not move my website).