Last new post doesn't always show up in the thread

[autje]

Really weird problem I've been having since upgrading to 4.2.2:
Say a thread has 80 posts, and somebody posts #81. You have your thread viewing set at 20 posts per page. When I click 'New posts', I see the info on #81. When you go to the profile of that post, on his activities, you see the post. However, when you go to the thread by clicking on 'Go to first unread', you're taken to post #80. At the top of the page, you will see that there is a new page, so the software is aware of there being an extra post, but when you click that page number (or just 'Last'), you are taken to the top of, say, page 2. As soon as somebody post #82 through Quick Reply, the effect is gone (so it's really hard to catch for me as well).

I don't have any caching on in my config.php (no disk caching or memcache or anything). It's also not easily reproducible, because it doesn't happen on every thread, and even in the threads where it happens, it doesn't happen on every multiple of 20 + 1. This also happens on threads that have been created after the upgrade.

Anybody recognize this, or have a clue?

[Zachery]

Do you have any third party addons, or modifications?

[autje]

A few, however, this didn't come up when I was on the version before the upgrade (4.2.0).

I'm trying to catch a 'live' example of this (not easy, given how this seems somewhat random, and resolves itself upon the next post), to then turn all plugins off with the disable_hook directive. Just curious if this was something someone had seen before. It's the posthread.php that. for some reason, goes wrong here. I'll post again after I've tested on a good example.

[Zachery]

That is always the first testing point though. Disable your third party addons and modifications.

[autje]

I noticed the issue looks slightly different when not logged in as a member, but the effect is mostly the same.

If you look at the attachment below, you'll see that the last post is by a member named Cédric. However, if you go to the thread itself (link follows), you'll see that post is nowhere to be found:

http://awardswatch.com/forums/showthread.php?35074-Best-Foreign-Language-Film-predictions-submissions-2014-2015/page16

I turned of all plugins (have no code modifications), but the issue remains. I have turned them on again, since some of them are crucial to members.

[autje]

Any ideas? The thread I posted is still there to check. Feel free to create an account if needed.

[Zachery]

Try rebuilding the thread and forum counters. Can you go into the database and confirm that he has a post in that thread?

[buddha69]

i have a similar issue. there are 12 pages of posts but you can only view up to page 11....

[buddha69]

I rebuilt the threads and that solved the problem.

[autje]

Rebuilding the threads and forums counters indeed fixed it for the thread I isolated. I will keep an eye on it to see if this issue doesn't return.

[autje]

Coming back to this (a bit late perhaps...)

As said, rebuilding thread and forum counters fixes this issue, but only for the threads that have said issue at the time. It doesn't prevent the issue from returning to other threads, including new threads created after the rebuilding. It doesn't happen to a lot of threads (thank God!), just at random to some. I have tried to discern a pattern, but alas.

To explain the problem once more: say a thread has 41 posts, and you go into the thread. The page navigation shows that there are three pages (with a setting of 20 posts per page, obviously), which should be correct: 20 posts on page 1, 20 posts on page 2, and one more post on page 3. However, not matter how you try, it's impossible to reach that third page. Clicking on the page number or 'Last page' only takes you to the first post of one of the other pages (within a thread always the same page, but it's not always the same page for all threads with this issue).

If you do a search for 'New Posts', the results show that 41st post as being the last one in the thread, so either inside the thread or outside, the software seems to know this post exists. But it is impossible to show it. However, as soon as someone makes post #42 in the thread (by using Quick Reply, for instance), the problem is gone: people can navigate to page 3, and see two posts (#41 and #42).

The number 41 is just an example here, it could just as easily be 61 or 281 or whatever, as long as it leads to the final page being just one post. And then it doesn't happen on all threads that have just one post on their final page.

I'm completely stumped as to what causes this. I've looked at showthread.php (with my limited PHP knowledge), and thought it might have something to do with deleted posts, but some of these threads (most, actually) don't have deleted posts at all.

[autje]

I'm not one for bumping my own threads, but: any idea?