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XF 1.2 One word/phrase causes 404 error

#1
I've been receiving emails from users, almost daily, about 404 errors that are occurring when trying to post a new thread.

Screenshot attached.



I went in and copied the thread text which the user claimed to cause the error and received the same result.

After slicing and removing text from the thread, I determined that the following statement was causing the error.

-- START

System (

-- END

If I try to post a new thread which this simple word combo "System (" it trips a 404 error.

Seeing that the error isn't produced here when I post this thread, I have to assume this is a configuration issue? Perhaps mod_security or something? Any way to see what other phrases are kicking off this error? Assuming that I am hearing about this daily, I have to assume there are multiple causes.

I'd appreciate and be thankful for any leads!