Same problem. My Videostream software doesn't startup anymore. It seems that the Contact Support is not available anymore... :(

Guys, I solved the problem!

I Updated Chrome from Version 56.0.2924.87 to 57.0.2987.54 beta (64-bit)
I seems that the previous version is not supporting videocast correctly.

Could you please download the beta version:
https://www.google.com/chrome/browser/beta.html

Since about 7 or 8 februari I’m not able to stream video from my Videocast PC software to my Chromecast on my TV. Before that I had NO problem at all, but suddenly it stopped working. Although I can not stream video I still can share my PC desktop to the TV and when I attempt to stream a video to my PC, the TV initially shows the streaming startscreen, but no video is loaded (show the is still a kind of trigger that works).
From my Samsung S6 or Ipad everything it is still working fine (Netflix, youtube etc). So I think the problem could be caused because of an update of the Videocast of Chrome software.
I tried a lot of things to repair this problem, but nothing seems to work, For example: i reinstalled the Videocast software, I reinstalled the chromecast device (twice!), checked my firewall ports, tried to load different video’s etc. But video anymore.

I hope anyone can help me out.

I have the same problem! Since previous week. Before that everything was working fine.. :(