Object Designer Shortcut Ctrl + B problem

Hi there,

i have installed Windows 7 recently an am running NAV 2009. Since the installation of Windows 7 the Shortcut Ctrl + B in the Object Designer doesn't work properly anymore. Focus switches to the File Menu in the Menubar instead of showing me C/SIDE Tables. It doesn't open the drop down menu as i pushed Ctrl + F but switches focus to File. Maybe the NAV Shortcut is overruled by some Windows order for switching Focus to first menu option...

Any ideas? Maybe the problem isn't caused by windows 7 either...

Thanks!