Thanks, that was not what happened but I may have discovered the cause:
I posted in the Lounge from a TL3 test account asking a single Regular to flag it as anything but Spam, the post immediately greyed out, I tested it again requesting a specific member flag me, and the same thing happened.
View as person whose post was flagged:
Neither member added the “message to poster” option, but I got the “Post hidden by community flags” automated PM for both single-flagged posts.
I then made a new test account, set it TL3 just to get Lounge access from a non-mod account, and saw this:
Finally, I logged back in from my mod account just to verify a single flag had done this.
So is the issue that the forum is treating just 1 post as the threshhold for hiding a post, instead of 3?
If so this is an admin & setting issue, so I apologise for posting it here, but I had absolutely no reason to think this would happen, since the previous threshold was 3 flags, which is perfect, it happened at the same time as the update to 2.3, and it’s (obviously) creating rather a lot of problems for a single flag to hide things, on a forum where mild over-use of flags has been encouraged.
I guess, to cap this off constructively - any chance mods can please be shown all the settings on things like this, without having access to change them? If I had seen this before, that 1 flag was going to hide a post and notify the person, it would have saved you on here and also me and the forum’s members, rather a lot of time.
Edit to add: I just realised though that not all posts getting 1 flag are hidden… there is a member who diligently flags about something specific to our forum and his flags are not hiding posts completely. He’s TL3 and at about 60% agreed (just because he flags for a specific issue that’s not a direct violation of rules).