I just wanted to remind everyone that if you temporarily downgrade to 4.3.20, you need to remember to disable the automatic update option for the SNAP Pro plugin on the main plugins page. Otherwise, WordPress will update the plugin right back to 4.3.23 again, thus recreating the same FB autoposting problem.
This is exactly what happened to me. Thus, I had to reinstall 4.3.20 again, and then immediately disable automatic update for the plugin.
