blob.jpg not a valid image

I was uploading some new images and selected about 7-8 at once. Without waiting for the uploader to finish loading the thumbnail previews, I went ahead and started the upload. The first image uploaded fine, the second one seemed to get stuck. I told it to stop upload, and then start again (without refreshing), and it wouldn’t go. So I pulled up the Chrome dev console, and it was reporting an error something like “blog1.jpg is not a valid image”.

Let me know if you can’t replicate it, and I’ll see if I can dig more into it on my site. For now, I’ll just make sure I let the thumbs/previews load before I hit Start Upload ??