Same here. To get around it I use the “New/Recently Updated Topics” button and click on an entry for the first post I read, after that the list of unread topics seems to work fine, except for coming up in the upper left of the screen.
+1 This works for me as well.
I do not know the source of the problem.
It has been wacky today for sure.
And giant emoji! 
Thanks, all - glad to know it’s not something to do with my computer.
what the hell?
Hmmm. Works ok for me. Maybe it had a momentary glitch? Sorry, I can’t do much from Munich.
Still acting up. It only works for me now when I’m on my PM page, and not from the Main Topics page.
Paul, we are fine for now. It is just an inconvenience. Have a great trip!
Not so sure about that, Elk. I do now get the panel from the Main Topics page, but when I clicked on one of the thread titles it now does not always go to the last unread message. In this case it went to the top of the thread.
The workaround is still helping for me. For now, at least. 
After clicking on a topic marked with a tiny green balloon on the New/Recently Updated Topics drop-down list, the # topics with unread posts button brings up the box - in a different place than usual, but at least it comes up.
I tried to upload an image of the workaround, but it looks like that function might not be working right now. I couldn’t browse from the Source box.
Did somebody accidentally feed the gremlins after midnight? 
tony22 said Not so sure about that, Elk.I do not mean to suggest everything is fine. Rather, we can survive until Paul returns.
+1 We definitely ought to be able to muddle through. 
Thanks guys. I haven’t a clue as to what the problem is but I’ll hire some tech support upon return.
Let’s finally upgrade to MyBB
I’ve just discovered a new issue. If you use smiles (e.g. colon - D) the post disappears.
don’t do that…
Alekz said Let's finally upgrade to MyBBIf you agree to install and maintain it, Paul may be interested.
The problem is the user database. The website’s based on Wordpress and we wanted an integrated experience so you sign into the site and now everything meshes - if we switch to another forum base that isn’t Wordpress compatible/easy that’s a problem and one I don’t want to deal with.
I can maintain both WordPress and MyBB, that’s not a problem. The problem is the single sign-on, indeed. There are different methods to integrate or bridge WP and MyBB, but usually WP uses MyBB DB, not the other way around. Another problem is supportability, because the most known plugins are not developed anymore.
I’m currently busy with my own WP/MyBB installations and I must say, that WP is not made with efficiency, scalability and performance in mind (I already mentioned this in various threads). And I would move all user activity from WP to somewhere. I do understand the decision to avoid complexity and use only one engine and one DB structure for everything, but I’m not sure if it’s the best solution for a long run.
The ideal solution would be to have a separate authentication method, independent from the rest of the services.
@Paul McGowan - Any clues yet on the forum gremlins that popped up while you were away?