Can you possibly upload a .svg copy? Inkscape can get picky about reading .ai files. Thanks!
EDIT: Actually I just made one. For Inkscape users:
https://docs.google.com/file/d/0B0iR...Q0RFZLU2s/edit
Note: In the preview on Google Drive, the balls have banding issues, but once you download it they will be smooth radial gradients.