Are your wifi networks seperate (ie two names... Primary 2.4ghz and secondary 5ghz)? Does your router have band isolation enabled? If your laptop is on 2.4 and the Chromecast is in 5ghz and the above question(s) are yes then you wouldn't be able to see if your right, but you can join the networks and ensure band isolation is not enabled so that you can communicate across bands.
Guys... if you are working in a system (laptop) where you have 2 graphic adapters... you can try to disable the "external one" and keep only the intel one. I think all this screen mirror solutions are based on Intel hardware so... from Windows, you need to have Intel processor, intel graphic adapter and even, Intel wifi card. At least for WiDi
We haven't heard back from Kippax, and it's been a few days, so I'm locking the thread. As always, feel free to make a new thread if you have any more questions or concerns.
Thank you for your help, Ashepherdson and Cracked!