I hope to keep this thread going. I to am suffering from the same problem.
To summarize, the problem is a split second hang of both the video and the audio during a screen transition/loading screen of a game. It could be a more simple transition, such as navigating a fullscreen menu, or a more drastic transition such as a death.
The most obvious culprit for me are classic games, such as ones made by rare. Banjo kazooie and Donkey Kong being a great example. When you enter a room, the screen transitions with a mostly black swipe of a zoom of the Game's logo. And without fail, When the HD60 is working over OBS, it will hang during these transitions. (Note, like previous posts, when working in any other software there is no hang during these transitions.)
(Edit: And i have also tested this across 3 computers. Each one with fresh installs, 2 with full uninstalls and reinstalls of the drivers.)
At no other part during the stream or recording does it hang. It only does this during the screen transitions.
I have further tested this with the WiiU, as that has native HDMI and i dont have to use an adapter. I then tested it with the game Klonoa, for the wii, and just as before the game will hang during transitions. (The most notable being when you die.)
Below are some links to my log files. One is of me just running around, performing tasks, and just letting the game run like normal without doing any screen transitions. The other, is me repeatedly falling to my death in order to force the transition screen. I can see little difference between them, but yall might have more luck.
Running around --
https://gist.github.com/anonymous/ce35562de1ff1e3bb3c4
Repeatedly Transitioning --
https://gist.github.com/anonymous/0d3ad59d27b33a38719e
Please note, that much like the previous participants of this thread, i have tried a mass of different settings to try and improve performance. I have tried adjusting the resolution, fps, and the buffers of both the encoding and the capture source. (Also, it will hang no matter the resolution and fps i set to for the capture source.)
When i made the logs, i tried setting things to optimal settings for best results. But, if anyone out there has any tips id very much appreciate it.
Otherwise, i would like to help keep this thread going for a possible future resolution.