I really love the SEO Facebook Comments but it seems it is having issues with my other plug ins. I have installed Version 18.104.22.168.
I was having issues deleting other plugins. It would not do it so I started deactivating my plugins one at a time until everything worked right. When I deactivated the SEO Facebook Comment Plugin, I was able to delete other plugins. When I reactivated that plugin I could no longer delete others.
IT looks like this issue had been addressed in the past by the developer but it is still occuring.