Crashes when adding link or image

When editing posts and adding a link the popup for adding links appears as normal. When all fields are filled out and I hit the “add link”-button it just goes white and returns to the posts view. The content I added since last save disappears too. This problem appears in both normal and full screen mode.
I solve it by adding the link in text mode instead, then it works fine.

When clicking the “add media” button in normal mode nothing happens.. The button just doesn’t work. But when in fullscreen mode it works fine.

I cant schedule updates anymore. Button does nothing.

What to do?

The problems started in last version of WP. I reinstalled and nothing happened, and now with version 3.5.1 problems persist.
Same problems in all browsers.