That is odd..

After you select the theme you want, click on anything on the menu to the
left. When the page refreshes it should be the theme you selected..

I don't see how it can work for some but not for others..

Not calling you stupid just seems a bit odd to me. I didn't know if maybe
you were expecting it to change when you clicked on the theme.. It won't,
you have to click on another link (ie cash, build, state overview ect ect..) and then it will change.