Thanks for a great plugin,
I found some problem please fix if possible,
The thumbnails of uploaded images are not visible after following the bellow procedures.
1. Upload image other then supported format so that message "xxxxxxx.xxx has an invalid extension. Valid extension(s): png, gif, jpg, jpeg." appears.
2. Now upload supported format e.g JPEG
3. The image will be uploaded but will not be visible in thumbnails.
the same problem also occurs when
1. Upload some supported images.
2. Change primary image.
3. Upload another supported image(This image will not be visible in thumbnails).