It seems to be that mark labels are automatically formatted as bold in Tableau 8 (8.0.1), even when the bold is switched off in the labels settings. Switching it on makes the label even bolder (and ugly). From what I can tell, it doesn't seem possible to get the label formatted normally.
The change in behaviour can be seen very easily by opening a workbook that uses mark labels in both Tableau 7 and 8. Does anyone know if this is a feature or a bug, and if there is a workaround?