Hello Nic.
I was hoping v 3345 will fix my issue but it did not.
I built a HTPC based on Gigabyte G.H81 AMO-UP mobo and Intel - i3-4340 HD4600 processor running on Win 8.1 Pro after update. The mobo has only one video out via HDMI which works fine with any computer monitor.
When I connect the system to the main TV, a plasma Panasonic Viera, I get a scrambled image during and after booting, while it works fine when I access to the Bios utility. TV and HDMI cable work fine as well when connected with the previous system or my Surface Pro (HD4000).
I spent a considerable amount of hours trying all the suitable drivers from Intel and Gigabyte and ask for support from both without success.
Any advice on the matter is very appreciated.
Regards,
Riccardo