Today while I was working on Christian Concealed Carry, I ran into an error uploading images in WordPress and grey thumbnails in Media Library. Apparently I wasn’t the first to discover this irritating bug.
Symptom: Image uploads appear to fail resulting in grey thumbnails in Media Library
The issue began with WordPress appearing to fail uploading images. I selected the images, chose Upload and the upload progress bar would “progress” fully, but then simply stall. This resulted in an error message displayed for each image I attempted to upload. Then, the image would show up in Media Library but as a generic grey thumbnail icon.