The issue about changing the Wordpress theme on win 10 : guys:
     i installed the wordpress on my win10, and i want to change the default theme , but i got a problem that the theme can not show the screenshot but default theme is ok!
    Look the following :
    [default theme][1]
    [using theme][2]
    [can't show the screenshot][3]
    [show screenshot][4]
    So the reason is? 
    I am looking forward to your answer! Thanks!
      [1]: https://i.stack.imgur.com/Sx5n2.png
      [2]: https://i.stack.imgur.com/RNYC9.png
      [3]: https://i.stack.imgur.com/ywpJu.png
      [4]: https://i.stack.imgur.com/iVc5k.png