When using C6 (current version) in win7 64 bit is it normal that when you have a menu option open and want to move to an adjacent menu,say from transport over to devices,there is a bit of a delay before the next menu opens? I dont remember seeing this when I was using 32bit?Just looks as if it kind of hesitates when doing this.
I think this is something controlled by Windows and not Cubase. Was your 32-bit system XP? In that case change to W7 may have triggered this behaviour.
Maybe you should try if this helps:
http://www.addictivetips.com/windows-tips/menu-delay-time-windows-7/