Problem with Quick tabs, not displaying node content

Hello, I'm using litejazz theme, and I have a problem with Quick Tabs: there's something wrong, cause tabs only display content when it comes from a block, but not from a node: tab section rests empty. On other themes it worked!
Another thing is when I go on admin/configure settings/quick tabs, that page comes out unthemed, exactly like when you don't configure any theme for your site.... I don't know if I made something wrong, or if there's some kind of conflict between litejazz and quick tabs!
Hope someone knows...
And... is there any tutorial on "magic tabs" module? I have to find an alternative!! thank you !!!!!!