Thank you for your post.
I am unable to replicate the issue on my iMac running Mac OS X 10.7.3 and FileMaker Pro 11.0v4. Nothing is distorted nor skewed.
Can you tell me a bit more about your computer? That is, pull down the Apple menu and select "About This Mac". Do you have any graphic accelerator cards installed? If so, try slowing down the accelerator. Any other information you can provide may be helpful.
Although you said it "does not affect product performance", do you notice any other display (distorted or skewed) issues on your layouts?
Have you tried running FileMaker Pro 11 on another computer? If so, does the problem also appear there?