Recently I find that when I post in a thread, the whole thing vanishes from the main forum/sub forum, and I have to look through my recent posts to find it and read it.
Is there a way I can fix this?
That's weird. Indie's got a lot more technical knowledge than me but I can't even think of a basic reason why.
Does the thread still show up in the general Recent Posts list (this one at the top) after you post?
No, it vanishes from there too. The only way I can back into the thread is via my content page on my profile, or via a like alert.