Do you try to use a classic skin with Lightweight RenderMode of the component? Another reason for the problem could be mix of components with different RenderMode values. All components on the page should have set the same render mode: Classic or Lightweight.
As to the rmSprite image, you can right click over it, choose Inspect and see which class is loading it on the page. After that overwrite the CSS class with background-image: none !important.
If you experience problems, please provide a live url to the problematic page or a simple runnable project which demonstrates the issue.