We’ve tried reuploading the same image, through both the website and studio, with slight modifications over the past few days, and each one is stuck in this forever-pending state. We’ve also tried uploading with multiple different accounts.
This is being investigated. It appears that in many cases, the images were approved but one or more sizes of thumbnail were not generated. Before making a request for moderation review, you can check to see if your image shows in a published place.