UITableView tableHeaderView not painting in SDK 3.0

Question

I am writing an iphone app. I use a UITableView and assign a my UIView derived class to the tableHeaderView property. When I build with SDK 3.1 the header displays properly. When I build with 3.0 the header is never painted. DrawRect is not called.

Is this a known SDK bug, or am I doing something wrong? The only thing that changes this table's appearance is changing the SDK version.

Thanks,