I have an upload feature for users (behind a login) that lets them upload jpg/gif files. After upload the files should be resized in a bunch of formats and saved. That doesn't always work, for reasons I'm not really sure about but most likely related to threads being blocked by other large uploads. So I have a scheduled task that runs every 15 minutes and checks if there are any outstanding images and then processes those. I'm getting the above error from time to time and it won't go away unless I download the image, open it in photoshop, then save it for web and re-upload, at which time it processes just fine (same size and all). What could this be?!
This is a feature just for staff in our office to upload images linked to schools they are responsible for, so we're not talking thousands of images here. 216 have been uploaded so far (in the space of a week) and I've had this error occur on about 4 or 5 of the images, but it's enough that it's annoying