yEd 3.12, Windows 7, Java 7 update 51. Windows is running under Virtual Box. File is on local drive or network drive (doesn't seem to make a difference). Possibly associated with a particular diagram (or my elements on it?). Nothing especially complex. Can send diagram if it helps. It doesn't crash as long as I don't use the Current Elements palette (although I've not tried other palettes since this started).
It looks like a Windows message "yEd Graph Editor has stopped working". Then it does its collecting information bit and offers to send Microsoft these files:
Files that help describe the problem:
I should add that I used yEd without this problem for about a month before this happened. I must admit that between then and now the VM was (routinely) updated. I could send you the yEd file if you want.