I wonder why it shows always the old template after updating not the new. I need to log out for showing the new.
What version of Luna are you using? The theme setting should be global. Unless you're talking about the accent color, in which case this only applies to guests and new users. You'll have to change your accent in your profile.
You can do anything
I use the latest from the website. I changed it in the ACP but nothing happens. After a logout it changed. When I re-login into the ACP I have the old red color, jsut on the front site is the new blue color. Thats... confusing. When I change a theme, I will change it for the complete website + the acp. May its just me. 😄
The Accent is a user-specific setting. Changing the color in the Backstage only changes the default setting for guests and new users. If you want another color for your own account, you'll have to go to your profile settings.