I have a similar problem as well, I am able to see the image and I am able to edit it, but only when I upload it for the first time.
So, say I upload two images for a post at the same time. I can edit one of them and put it in the post, but when I go to “Insert image > Gallery” to insert the second image, I can’t because nothing happens when I click on the “Show” link next to either image.