One other thing I have noticed is that some threads appear to be locked, but without a mod saying 'I'm locking this because...' and when looking at those threads, there doesn't seem to be another bad in them. Some time later they un-lock. Seems like the database is become de-synchronised.
EDIT: Like this one:
http://www.subsim.com/radioroom/showthread.php?t=161985
Maybe that one was locked because it's a duplicate, but I'd think a mod would say something in it, or merge it.