Update (Nov 20, 2019): Adobe announced today that they'd come out with a new set of updates to fix the problems in the Sep 24 updates. Today's updates address the various issues reported below about the Sept update. It's important to proceed with performing the updates, for the benefit of the security updates as I discussed below back in Sept.
I shared here Tuesday the news that Adobe had announced there were new updates for CF2018 and 2016, released that day.
But as has happened every few releases, a lot of folks are reporting various problems, enough for me to say that folks may want to hold off on applying these updates, which I realize is a risky proposition since the update includes security fixes. More on that below.
Update Nov 13: Adobe has released a preview of new updates, meant to address the issues in these Sep 2019 updates. For more, see my post: https://www.carehart.org/blog/client/index.cfm/2019/11/13/preview_available_for_new_coldfusion_updates//
Update Sep 27: Adobe has commented below (Sep 27) saying that there are now fixes available for the bugs reported (but that you must request each directly from them, and that an update refresh is not planned). See Vamsee's comment below, and my reply to that (asking for a bit more detail). For now, I have added any links I've seen to fixes for any of these.
Of course, if you need something in the update and want to try it, just be sure to do ample testing, and check out some of the problems people are reporting below. And beware that some issues may only happen under load, so you may not find them in your own testing.
Otherwise, let's see if Adobe may either "refresh" the update or may well "pull" it, as they did with the Feb 2019 updates for CF 2016 and 11, when they replaced those with another a week later (see the "Note" about it at the top of that page).
For more, read on.