Windows Blue is under testing so to be expected I would imagine. BigMuscle is working with RTM. Yeah, I guess it will work on next Windows without a problem but it will need to pack shader programs (two very short files) together with my application. These files are very simple so it is no problem but I don't want to do it now because I can reuse that one in Win8 DWM. Well, thank you for your work. We'll wait.