Other question, if it stop rendering why with game capture this problem dont happen, even alt+tabbing with a game capture and game in fullscreen things works fine when starting capturing again.
The problem with screen capture with fullscreen is not exactly it becoming black after alt+tabbings, but than if you alt+tab even after stopped recording and back to game after that screen capture dont work anymore creating black new recording while Game capture will make a new good video.
1st example Display capture: I launch game, dont start recording yet, then alt+tab and come back to game. Now i start recording and stop then there will be a totally black screen video.
2nd example Game capture: I do same thing launch game, dont start recording, alt+tab then come back to game. Now i start recording and stop, i go check recorded video and its pretty fine.