Though I got to be one of the beta testers for Tableau version 8, I missed an effect of Tableau’s new rendering engine that affects how we customize Grand Totals.
If you’re in a hurry, here’s the key bit: In version 8, if you are customizing grand totals using the table calculation technique from Customizing Grand Totals – Part 2, set the menu item Analysis->Stack Marks->Off. Alternatively, you can use a table calc on the Pages Shelf, read on for that one.