I mean, game may use dx12 (you need to force dx11 or dx10 or dx9).
Sometimes, when you update Studio, you need to recreate capture sources (delete old 'Game Capture' and add new 'Game Capture' source) or you may got black screen. If you just installed OBS Studio then you can skip this step.
Something doesn't allow Studio to get process name, error from your log:
Code:
14:06:01.005: [game-capture: 'Game Capture'] attempting to hook fullscreen process: unknown
14:06:01.005: [game-capture: 'Game Capture'] could not open process: (null)
this mean you cannot hook this application. Also, you may try to specify .exe file manually. Or try
fr-043 demo, and see, can you capture it or not (full steps there:
Game capture not working).
The most known difficulties:
Odd Game Capture Black Screens (under the spoiler) still can take place. UWP (Metro/Windows store), DirectX 12 applications is not supported by 'Game Capture' in current OBS Studio build.