Sandboxie DOTA 2 VAC

[PTCH.YOLO]

Just a few days ago I could play 2 instances of Dota 2 in the same PC. First steam user sandboxed while the other default I have this problem while the other is being sandboxed VAC is not letting us play dota 2 we start DOTA 2 but we can't find match. It's just a few days ago that I can't play dota 2 no more using sandboxie. sorry for my bad english it's not my first language.