Why are worksheet title Custom Theme settings not being applied

Hi David,  

Before you file it as a bug, check if those titles were ever edited by hand. When you open Edit Title and change the font, size or colour there, Tableau saves that formatting on the title text itself. The Custom Themes help page says this directly: even with Override, an imported theme doesn't replace formatting done in the rich text editor, and Edit Title is that editor. A template workbook is the classic place for this, because someone styled the titles once and it stuck. Also check you picked Override and not Preserve when you imported the theme, since Preserve keeps whatever formatting the workbook already has.  

Easy test: add a new sheet to the same workbook and don't touch its title. If the new one comes out in 

#878a8f

 Tableau Semibold 14 and the old ones don't, it's the per-title formatting, not the theme.  

I checked the behaviour with Format > Workbook > Worksheet Titles on Superstore (screenshot): the sheet with the untouched title changed, the one I had formatted in Edit Title kept its own font and colour 

To fix the existing titles: right-click the title, Edit Title, click Reset, OK. That puts it back to the default title and the theme can style it again. If a title had custom text you'll have to retype it after the reset, just don't change the font while you do.