Hi Lorraine,
This could be an issue if you have more than 1 version of MIPro installed.
For the theme templates to work fine, please check the path of the directory preference for thematic templates at Backstage > options > Directories.
The path should be pointing to %appdata%\MapInfo\MapInfo\Professional\1700\THMTMPLT\
Close MapInfo Pro and delete all the contents inside %appdata%\MapInfo\MapInfo\Professional\1700\THMTMPLT\ folder and copy the available content from Program File folder\AddUser\ThmTmplt to %appdata%\MapInfo\MapInfo\Professional\1700\THMTMPLT\
Start MIPRO and it should work now.
Regards,
Shweta