[Qt-interest] Black flash problem in OSX

[Andrew Stuart]

When you click on a Qt app in OSX to bring it to the foreground, there  
will be a black flash over areas of the app prior to coming full to  
the foreground.

This does not happen if you click on the app icon in the dock - doing  
so bring the Qt app cleanly to the foreground.

This problem can be seen in the Qt demo apps for OSX.

Does anyone have any idea why this happens?

is it possible to bring a Qt application to the foreground on OSX  
without a black flash appearing?

Any help appreciated.

Thanks

Andrew