Unable to sset product image

I used to be able to set Featured Images for individual products. I tried setting a new Featured Image for each of my products, and WC is not letting me set the Featured Image. Steps to reproduce bug:

Click on Products and select a product to edit
Click on ‘Set Featured Image’ on right-hand sidebar
Select image from Media Library I would like to use as Featured Image
Click ‘Set featured image’ button at bottom right of window
Result: No thumbnail of the selected image shows up in the Featured Image box and the ‘Set featured image’ link still remains.

Expected Behavior: Thumbnail shows up of the selected image and the link for ‘Remove featured image’ should show up below the thumbnail.

Various Notes:
-I am able to successfully add images to the ‘Product Gallery’ box on the right-hand sidebar and these images show up correctly on my site
-When I originally set featured images, and I clicked on the Media Library, the ‘Uploaded to’ field correctly said the individual product that I uploaded the image to. This time around, when I uploaded new images I wanted to use as my Featured Image, and after clicking on the Media Library, the ‘Uploaded to’ field simply says ‘unattached’ so I manually ‘attached’ the photo to the proper product
-After going through the steps above to reproduce the bug, when I click on the ‘Set featured image’ link again, the Set Featured Image window pops up showing all the images from my Media Library, and the default selected image is a blank gray box (with the checkmark in the top right of the thumbnail) that has no attributes like title and caption. This is strange

The page I need help with: [log in to see the link]