The drop zone is not set in IE 9 and lower by design, because those browsers does not support drag'n'drop. I was unable to reproduce the exact behavior from the screenshot, but I admit that the styles for the margin around the button are missing in IE 9 (you could find the screenshot attached). The behavior is reproducible in our demos
and it will be fixed for the upcoming service pack.
Regarding the current case, please make sure that the browser is not in "Compatibility view" or "Quirks mode" and that there are no other custom styles applied.
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