I am a little surprised that using the standard embed used by the tools you do not automatically show HTML5 if you do not have Flash enabled.
I checked both Chrome and Safari on Mac and I have also checked sites like 360cities and SamRohn which I know have HTML5 KRpano support.
360cities gives me the get Flashplayer on the frontpage and if you try individual pages you just get a never ending loading bar.
Also the KRPano Weingut Tour (Automatic Flash or HTML5) example just give me a get flashplayer
Hans