Also if I may add:
Be sure to disable Auto Rotate if your using a Surface Pro. I walk around my classroom and write notes and solve math problems. If I set the Surface down or hold it wrong it will want to rotate the screen. If this happens the TV gets squirrelly and you may have to reconnect.
Also as a side note I've been able to play videos pretty well across the screen share.
Hope this helps.
No I haven't. No luck and LG Support is worthless. If it was as simple as the instructions you copied and pasted on the post, then it would be done. I have those same instructions and to no avail. I wish it was that simple.