ghost shadows and incorrect FPS/vsync

I am using Unity 4.5.2f3 and SDK 0.4.2 and I can't get direct mode to work.
Any ideas ? I think you are using Unity 4.5.3 and SDK 0.4.1 right ?

I am using Unity 4.5.3 and SDK 0.4.1. As for direct to HMD mode, I had to do a little song and dance to get that to work for me. First make sure you have all the right software installed and the firmware up to date. Then, switch it to direct to HMD mode and restart the tracking service. Next, try and run the Unity Tuscany demo. Those steps worked for me.

I am not sure about what you say for the 60FPS in extended mode. The rift refresh rate is 75Hz so it should be the same in extended mode non ? My main laptop screen is 60FPS so I think it has to do something with that, no ?

Sorry about that. My explanation was unclear. In extended mode your computer treats the Rift as a monitor and thus uses your graphics card as the display driver. I think there are some issues with VSync and running multiple displays of varying refresh rates (especially if the refresh rates are not "clear" multiples of each other [i.e. 60Hz monitor can run VSync games at 30 FPS or 60 FPS]). I don't recommend this, but you could overdrive your laptop display to 75 Hz if you want to get 75 FPS out of your DK 2 when in extended mode. I would check other forums to see if this is an "ok" option.

Hope this helps.