Massage is too short?
 

I've just upgraded to vbulletin 3.7.0 a few day ago. Everything seem to be okay. But there is one problem: My members who write a super-long-post and tried to post but there was a error say "The massage you enter is too short. Please lengthen it to at least 5 characters" and as I said, the post was very long. The problem occur with editing and posting with too many character on the post.

Any idea how to solve this problem?

Greatly appriciated

It's probably a modification causing the problem. Try disabling them and see if you still have the problem.

Sometimes if they put their entire posts in tags, it won't count as characters. For example, I know the text inside quote tags doesn't count as characters.

What kind of mod?

Um, I don't know. A mod that has to do with posting? Try disabling them each and see if the problem goes away.