I would like that too. What I do in these cases is use the File-Open-Recent menu, where the current project is (almost always) the first one in the list. That will cause a "Save?" prompt, you say no, and R will then wipe the currently open ver and open the last saved one in the same "tab." Re: undoing... would be great if the undo history could indicate each time the project is saved, and always show a "session opened" entry... which it does sometimes but not everytime a project opens (not sure why that is.) Better yet, give the undo window a right-click option to take you back to the last saved state.