That option has always had issues, and as I didnt write it, ive never had the time to look into why.
I suggest you simply dont use it (I dont). It was removed from the 4.0 version.
You can always use the lock tables option, but only do it at a very quiet period as visitors will experince the forum hanging while you do, and eventually you will start to get "too many connections" errors as the mysql process queue backs up waiting for write access.
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