I can't get preview thumbnails to display.

I've tried changing my display settings to say "view thumbnails in gallery not full resolution" and I've tried reuploading the images for both of those several times, to no avail.

They're square. The system says it'll resize it to whatever size the thumbnails need to be. I don't know what I'm doing wrong and I'm sorry in advance to anybody who needs eyebleach until I can get it fixed.