PD8: Switches automatically to Windows while working in OSX

Hi,

some days ago I updated vom PD6 to PD8.
The Version has a very strange behavior - I work in OSX while Windows is booting or runs some programs.
Since the update I switch automatically to the running windows if there's something happen - so I have to switch every time back to my OSX application (e.g browser).

Is there a way to disable this behavior?

Thanks

Al