I am unable to crop photos as I was previously able to do. This morning, I went to crop a photo. Rather than have sharp corners, they are now rounded (with white broken lines along the perimeter). If I try to crop the shot, it only crops it a tiny amount.

I don't know what I've done to change the setting. Could someone help me reset it so that normal square corners and cropping images can be restored, please?

Thank you,