Note: If you are able to use another browser, like Chrome, Firefox, or another version of Internet Explorer, you can re-order elements. As of now, only Internet Explorer 9 is having these issues that we know of.
Looks like this was possibly a one-off issue, we are currently re-investigating. At this point, it appears like re-ordering of elements is working in Internet Explorer 9. If you continue to see issues, please let us know!