[SOLVED] I uninstalled the tablet app. Upon re-install the tablet paired with the PC :)
linux mint desktop, Nexus 9 tablet, Chromecast 2, Videostream lifetime
Everything works and plays fine. I do note when I try to [SETUP -> PAIR] the app will not find the PC. The local video files do list & sync fine.
Maybe look for a [pairing] option
Linux Mint 17.3 w/ MATE desktop using Chromecast 2
Videostream works just fine :)