I can not exactly reproduce the bug at this moment but since I am a Nuendo user (from v5) I randomly experience that when I save a template with (a lot of) ruler tracks in a certain format, close it, then create a new project with ruler tracks in a different format, then the saved template will have the ruler tracks’ format changed when opened.
This is what I posted when it happened to me (it still happens a couple of times a week… 
)
Niek/ Amsterdam