Greetings, Brilliant moderators,
When I upload an image to a problem and then click preview and I get an error due to the image being too large, upon going 'back' the problem disappears - entirely. This can be extremely frustrating if you haven't saved your latex code upon clicking preview - as have happened to me a few times.
I suggest creating an automatic image-check system for size so that if we click preview we either get a message or when we upload the image we get a message that it's too large. Otherwise, simply spitting an Error message in our face is irritating.