Why touch control on Chromebook is not available while casting to ViewBoard?

Due to ChromeOS security policies and protocol limitations, "Wireless Casting" via vCast does not support reverse touch control from the ViewBoard to the Chromebook. Recommended Workarounds: Wired Connection (Recommended): Use an HDMI cable for video and a USB Touch cable (Type-A to Type-B) to connect the Chromebook and ViewBoard for full ...

Why do I get a black screen when using Vcast and Youtube/Amazon prime/Netflix?

Refer to this FAQ.