4.5.1: Image resize problem, not able to insert into post

Hello,

I’m having trouble while resizing images since updating to 4.5.1.
Whenever I resize an image and click on the “insert into post” button nothing happens. I have to publish the post and insert the resized image afterwards.
On another blog, which still runs on 4.5, there is a “back” button instead of “insert into post” when resizing the image. Clicking on back leads to the media overview, clicking on “insert into post” there still works.

Is there any solution to this problem? There are about 80 authors on my blog and I’m getting many trouble reports for this issue.

Best regards