importin image into a post

Lately im not able to import images into a post either from PC or media library, when i click “Insert image” on the post editor, im redirected to another page where i can import the image into wordpress (before the background was getting grey and the form of image import was in the foreground) but I have just the chance to upload into the media library as it does not go to the post even if I click on “insert into the post” link
I have tried to open the media library but the link “show” on the right does not work at all, furthermore, Im not able to drag widgets position and open the settings of them from the arrow on the right of the widget bar, I tried with same result from IE, Chrome, Firefox and in different computer, no way.
Anybody can help?