I hadn't used any of the message boards since last Saturday, then went on to a few tonight and quickly noticed that something's now very different than ever before, in a not-good way. It significantly handicaps navigation.
Until now, it's always been that when you're in a specific Movie/TV/Celebrity discussion thread, the title/name of whatever the movie, show, or person is appears over top the thread. However now, just "Discuss → General" appears up there, instead of (for example) Discuss → Movie → North by Northwest. Furthermore, until now, you could always, in the long column that appears to the left of a thread, see and click on that particular movie or t.v. show title, or the celebrity's name, and immediately be on that title's or person's overview or profile page, like you were a minute or two earlier. Now, solely "Back" and "My Profile" are accessible over to the left - and neither thing is of any usefulness, whatsoever ("Back" simply takes you to - no matter what page you last were on - "Discuss → General"), for accessing either the overview/profile in question nor enabling us to see and access other discussion threads for the same movie/show/celebrity, or even simply be able to click on the "Movie" tab to take us to other (about whatever other titles) same-forum Movie/TV/Celebrity discussions. Discuss → General is everything, collectively, from any forum category - including stuff on the Support forum (its General category).
Using the example of the thread that at the moment happens to be the newest one with activity on the Movies discussion forum, you can see what all I'm referring to: https://www.themoviedb.org/discuss/58ce48369251415a7d01e93b
Try any other discussion thread, and it's always the exact same way now - that over top all that appears is "Discuss → General" (nothing specific to the title/name in question; likewise there's no longer any available left-column navigation option that'll take you to anything else that pertains to the same movie, show, or celebrity). A particular movie's, show's, or person's list of created threads appear perfectly and normally, like always before, until you access a particular thread and then are ready to navigate out from it to whatever else. Entering a thread appears to be what now somehow changes the experience.
Incidentally, trying powering down my computer, then turning it back on, even logging out of TMDb, then back in, made no difference, when I checked.
Meanwhile, also tonight I did a minor (simply adjusted the topic heading) revision to one of my past movie threads, clicked on "Save", the thread immediately inexplicably locked, I at first could still see the thread listed, clicked on its title, though then got the response that it was private and could not be accessed (even though I hadn't even locked it - it somehow locked on its own). Then I went way down my personal Discussions history to early June 2017, which is when the thread was from, and it no longer appears listed there - either as locked nor otherwise. Now I'm afraid to chance editing any other of my past threads, as I wonder if doing so may result in them, likewise, locking and/or vanishing inexplicably.
At any rate, at present there are some issues with the message boards feature.
FYI: I just now checked, and all is still good, like normal/usual, with Content Issue threads; they still show either "Movie", "TV", or "People", plus a title or person's name, above the thread. Also the column to the left of the thread continues to show the same options as always before. As an example, here's the thread that presently is the newest one added to the Content Issues queue: https://www.themoviedb.org/tv/61517-our-girl/discuss/5d4cd3561b72940012da8ac5