I'll try to respond both here and to Google Help: we did test our files on 10.4.11 (and one machine with ATI 1600 - the common MacBook Pro graphics card of 2 years ago), and we're not seeing it. To send in the file, Help->Contact Us->File a Bug and you can attach a file to the bug you're reporting. I'll get it from our support group and we'll test with your OS & graphics card, and this time with your file. Thanks.

We have had a regression bug from LayOut 1 where this would happen, but we haven't seen it lately. Just for grins, upgrade to 2.1.5803 if you could: LayOut->Check for Update.