I'm not totally sure how to describe this problem... my apologies for the vagueness in wording. yEd has this feature where if you add a new node and place it next to a node it tells you if it's in a straight line, or if it's between two nodes, tells you if it's midway between them. I took a screenshot, and now that automatic... alignment? ... doesn't seem to be working. I tried reloading an older file, restarting the computer, reinstalling yEd, but none of those seem to have an effect. I'm pretty sure I just toggled off some option somehow, but I have no idea how to get it back.