I'm also having the same issue...
Updated to GFE 1.8 and streaming stopped working. There's also no tab for Streaming in the options/settings.
I've removed/installed several times GFE 1.7 and 1.8, removed driver, reinstalled, rebooted PC/Shield, factory reset Shield, etc... Nothing helped.
There's a lot of people with the same issue:
When trying to install the 1.8 update, it failed. I had to manually kill/remove the process/service of NvStream. IMHO, this last version sucks big time.
- Windows 8.1 Pro X64
- Core i7 920@2,66Ghz
- GTX 650 Ti
- 16GB DDR3
- Asus RT-N16 (Tomato Firmware v1.28.7503 MIPSR2Toastman-RT K26 USB VPN)
HTC 8x Windows Phone 8 (GDR3)
HTC HD2 with Android 4.2.2
Asus Transformer Prime 32GB + Dock
Surface RT 32GB
Surface Pro 2 128GB