fivestar-block doesnt work in vertain theme

Hi there!

On my site I have two themes in action, one for the admin and the other for the user. I want to use fivestar.module in a block and in my admin-theme (garland) this is working really fine. But when I switch to my other, selfmade user-theme the block isn't showing up any more.
And I don't understand this.

Should I insert any special kind of function in my template-php?
I don't get the difference...

Thank You!!!