Vanishing point is a great and uber tool!
But how many ppl have pulled out the hairs of the 'ESC' = EXIT without save button?
Its so common that you pres ESC if you dont want a tool like crop/transform.
Well WHY the hell did adobe make the ESC button a exit in vanishing point! Without asking to save!
Specially when you are setting up your GRID.. it kinda feels like the crop tools. So if you dont like the way you set it up you wanna press ESC cause that is the way PS works.. not.
10 minutes of work gone, 15minutes of work gone, ect... :)