Stock By Attributes not auto-updating quantities

I have my Stock by Attributes add-on set up to keep track of quantity of items per size. It was working fine in the beginning but I recently noticed it stopped updating the product quantities when people order a product. I have been manually updating the quantities each time now.... Why would this be happening?

Please refer to the existing support threads for stock by attributes for explanations of the two possible causes of this problem.

Thanks Kuroi...
However I have just spent an hour looking through those topics for a problem like mine and cannot find one...
This isn't the first time i've searched for it either.. I wouldn't have posted if i didn't look first ;)

Can anyone help me out or send me a link or something? I'm tired and 50+ pages per topic is just way too insane to dissect