Cmake configure doesn't stop

Hi, I am know configuring opencv 3.1.0 with Cmake 3.5.1, and I want to use it later in Visual Studio 2015. The problem is that the configure step never stops. As you see in the picture:  Has anyone encountered the same problem??? What's more, the configure entries that I see in Cmake are different from others. For example, when I click 'Configure', sometimes I don't see the Python entries. The Cmake is so unstable...