I've been working on a project and had to switch to a different one. So I closed SE without leaving the workspace and proceeded to sandbox the project which involves saving then deleting the project I was working on and then bringing in the new project. When SE opened, it couldn't find the old workspace so it popped up a box telling me so, but then it opened all the child windows I had open previously and left them empty.
Attached is a picture of the stack trace, since there doesn't seem to be a copy function for it.
Win 7, SE RC2