Unable to load payload into QW757

I purchased the QW757 about a week and a half ago and I have run into a problem. No matter what I do, I cannot load payload into any slots other than the Top Front Hold and Top Mid Hold sections. I have used the livery manager as well as gone into the fuel and payload menu within FSX. When I attempt to load the weight manually, it causes the aircraft to "resettle" as if weight is applied, but then immediately goes back to the weight it was. The only way to add weight is to put all of the weight in the Top Mid Hold section, but the CG tends to be a bit far forward. Both FSX and the Livery Manager have admin rights and I have installed FSX into C:/FSX so I do not think its a rights problem. All other aircraft I am able to load payloads just fine. I posted this over on the QW support forums about a week ago, but have not gotten any responses from the developers, so I figured I would try here. Any ideas? Thank you.

Nick