When I use the buttons on the main VA window title bar to maximise or minimise the application, it always locks for 5 seconds before actioning the button press. It makes no difference if I minimise to the System Tray or the taskbar.
The mouse cursor is static and non-reponsive during the hang, though other open windows will continue to play video (or whatever they're doing) but I can't alt-tab to them as the keyboard is also non-responsive.
Interestingly, if I double-click on the title bar to maximise/restore the window to/from full screen this works fine.
I'm running a fully patched Windows 7 with VA running as admin and have had this behaviour since my original purchase of version 1.6 through to the current 1.7.2.
It's a vanilla install of VA with no plugins and one profile with a handful of voice commands defined. I run with mouse & keyboard macros disabled.