So I\'ve got various reports that consist of a DataSet rendered in a Tablix... pretty garden variety stuff. There is a property for the Tablix control named RepeatColumnHead
In your reports where the header doesn't repeat, did you delete the default header row in the tablix at any point? Once I did that, no matter what setting I tried, the header in the tablix wouldn't repeat. I had to re-create the tablix to get it to work.