Chrome on my desktop just updated to version 58, and all of a sudden I was prevented access to the site because of an SSL issue. I wasn't even able to ignore the warning and continue, as usual, just a total block. Chrome on my laptop (running 57 at the time) was fine, so I figured it must be this issue.
So this, of course, has somewhat forced my hand into moving over to Let's Encrypt, which I did this morning.
I was a bit worried about doing this because I wasn't sure what would happen about the previous certs I had installed, and in fact, they did cause an issue at first, but all I needed to do was delete the old certs and rebuild the container.
If anyone notices anything funny about the site, please let me know.
Thank you very much to @rythie for letting us use his certs up until this point