Reinstalling won’t do anything. I think there is a scripting error or FB updated something and hasn’t told anyone yet. I had seen this issue with Hootsuite in the past when i used them. The error was similar and it turned out FB had some issues on their end. And Hootsuite had to update their scripts.
Also, “instagram” disappeared. I can’t post to there…as it isn’t showing up.
And Twitter I can’t post to it, manually I can