UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
Platform: 11021.13.0

Steps to reproduce the problem:
1. Cast via Browser or settings
2. Pick Chromecast
3. Tab or Full screen only blank screen on cast device
4. Tried on a different Chromecasts same result.

What is the expected behavior?
It should cast.

What went wrong?
After the software update, I've been unable to use casting to Chromecast at all.

Did this work before? Yes Two versions before

Chrome version: 70.0.3538.16  Channel: dev
OS Version: 70.0.3538.16
Flash Version: 31.0.0.101

This is a tool I need urgently to work again.