User visits counter isn't increasing for a specific user

I have one user for whom the visits counter in the About box of his profile has stopped working.
Can anyone suggest what might cause this and/or how I could fix it?
Thanks.
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Answers
I think it counts the number of "member" visit it, not the times they visit, i think so. Sorry if it not help you
bh8vn
Thanks, but it is definitely specific to the user - it is on their profile page.
whu, you have to check in the database what is wrong. You cannot fix this from the frontend, just see if MySQL query can help you.
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UnderDog
Thanks for the response. I'm afraid you credit me with knowing more than I do.
I wouldn't know how to use MySQL query in this regard.
I'm slightly baffled as it is not site wide, but relates just to one user.
I'm also having this issue, is it possibly related to Last IP not being recorded? On those profiles where visits equal 0, there's no Last IP shown either?
How do we fix this in MySQL, surely the PHP is responsible for adding this data to the database, why is it presumed to be a database issue?
actually just seen this as a possible cause:
http://vanillaforums.org/discussion/comment/97234#Comment_97234
Is this 'bug' still relevent to latest version?