Just thinking but.
The person in question is a moderator, So I don't know the rights assigned to him. But I do know with my last host I had issues with the cache when posts were entered. And then deleted or moved.
In the active topics island the posts still appeared but the links were broken until I rebuild content.
Just my 2cents.
BTW since I changed hosts I don't seem to have that issue anymore.
Blue Man Group
There is no such thing as stupid questions. Just stupid answers