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When an element has both border-radius and background-size, and backgroundSize.js is being ran (a background-size shiv for older browsers), rounded corners will no longer show up.
Example: (corners break when backgroundSize.js is applied to this element with PIE):
background: url("image.gif") no-repeat;
This is the background-size shiv:
These will unfortunately never work together, because they have to modify the DOMs in incompatible ways. But support for background-size is coming in a near-future release of PIE, so that should be a better solution anyway.