Sharing Not Working on 4.5.3

Social sharing is no longer working and I think it’s since the upgrade to 4.5.3. I’m set to auto-post to my Facebook page and Twitter account and that has not happened for at least a week.

(I realized it because I was no longer getting comments, likes, retweets on new posts and when I checked the targets, I saw the stuff wasn’t being posted and I needed to manually post.)

This has worked fine for me for two years. I have made no changes to the configuration on WordPress or on Facebook or Twitter. It’s just not happening.

I tried deleting the connections to Facebook and Twitter and then setting them up again as new. No luck, still same result.

Please advise.