we're looking into this bug now. Thanks!
Thank you for the bug report. I can reproduce this on 1.5.1, the good news is that we've fixed this in version 2 of the toolkit which should be coming to labs soon.
Great. I'll be keeping an eye out for the new version.
Bob meant: Pixel Bender Developer Network (http://www.adobe.com/devnet/pixelbender/), not labs.
The Pixel Bender 2.0 toolkit is also installed with CS5 AE or Flash Pro or any suite that includes either of those applications.