I checked my account. In my case the difference is only $60 since January 1, 2008. This is the time period in question, correct? Jan. 1, 2008 through now?
I don’t know how many people know this, but last year Brightshare actually overpaid many affiliates (including me), due to some kind of back-end glitch. They finally caught it after several months, but everyone got to keep the extra money they received.
So, I’m not going to bother them about this. It’s only 60 bucks (for me anyway). Certainly if you’re missing a lot more than that, I would do something about it — but if it’s something small, I would just let it go.