Thank you for your post. Unfortunately, I cannot duplicate the problem (iMac, 10.5.6, Advanced 10), and I know that doesn't help you. I definitely want to duplicate the problem, so let me ask some additional questions.
1. Was this file originally created in FileMaker Pro 10 or a previous version?
2. What type of image is the graphic? That is, JPG? TIF? PNG?...
3. What is the source of the graphic? That is, what application created the graphic (Photoshop?).
4. Was the object rotated?
Anything else you can provide would be appreciative, and it may direct me to possible causes.