Are you having trouble with your animation in Internet Explorer 9? Here is what fixed MY issues:
Are you using any SVG files? If so, IE9 might crop them akwardly. If they are coming out completely wrong (upside down, reversed, skewed, etc.) then your probably using those SVG files within Symbols. I found that most any svg I isued within a symbol (espically symbols within symbols that had rotation) refused to act properly. The simple fix was to go with PNG files instead for these uses, although it did slightly increase file size (30KB at most). Hope this helps anyone else out there having similar issues.