I have been trying to get this example code working on the N8.
It basically allows you to rub through a layer on top to show an image below.
On the N97 the code (and example) work as expected but on the N8 there's artifacts left behind. The interesting part is that when you turn your screen off and back on (eg lock phone) the artifacts disappear and it works as expected.
I've tried a few tricks to trigger redrawing of the screen but none have resolved the issue. Does anyone know if there's a workaround for this issue or is it a bug we're stuck with?
I've attached a screenshot of what the example SWF from the tutorial does on the N8.