How do I repeat column header (captions) in RDLC reports?
It says here http://msdn.microsoft.com/EN-US/library/735D1EE7-3C89-46D8-A346-504DB10F33E1.aspx#TableNoGroups:>
I just had this same problem and found that you likely need to go a bit further from the standard properties (right-side dialog) into the Advance properties.
After selecting your Tablix, there should be a frame at the bottom showing Row Groups and Column Groups, with an arrow at the far right. Click the arrow and select advanced mode.
Now, the RowGroups section should show (Static) and (Details1), maybe more depending upon your Tablix. Select the static row and in the right-side properties window, there will be an option to RepeatOnNewPage.
After I did this, my column headers displayed as I expected.
Good Luck!