It's happened to me numerous times when clients have uploaded images that are too big for GD on their server to handle.
The result is 'Fatal Error: Allowed Memory Size' errors on the screen, and the CMS page becomes unusable where that image is attached.
This usually means I have to go and search on the server for large images, download, make it smaller, upload agian, and it's all ok, but it's a real pain...
I'm wondering if anyone can help me out, what I'm hoping for is:
1: a quick way of knowing which particular image cuased this error - eg, getting a better error message back from 'sapphire/filesystem/GD.php'
2: some way Silverstripe sees the error, and instead of just failing completely, it allows the user to remove the image, and try again
I'm working here with SS 2.4, but i think it's the same issue in 3