I was debugging a project, the Unity-VS integration was working fine. At some point, it just stopped working. All I did was, exit play mode and set a new break point. From that moment the "Attach to Unity" button changed to "Start". Now the only way to make it work, is by closing and reopening Unity and then opening the C# project with the Assets' menu option, but it is very annoying because, if I exit play mode the "Attach to Unity" button stops working, and the only way to make it work again, is to repeat the whole process. Any ideas?