Hi, I had same problem.
I solve it this steps.
1. Facebook Feed WD -> Options, click “Uninstall” button.
2. Check “Yes” and click “UNINSTALL” button.
3. Plugin deactivate.
4. Plugin Menu-> WD Facebook Feed activate.
5. set options and feed setting, now save success!
maybe wd_fb_info table not upgraded when plugin upgrade from 1.0.37.
So table delete, and create new.
