Alt + Tab is designated for the old 2D option whereas you'll want to use Windows + Tab to use Flip 3D. If you want the options to stay on your screen without holding the keys down then press Windows + Ctrl + Tab. (Same can be done with the 2D option using Ctrl + Alt + Tab.)

As to the hotkeys, if your keyboard has user-definable hotkeys try them instead...I too find standard hotkey combinations rarely work.

John