There is no visible difference between 200% and 150% zooms; same goes for 100% and 75%.  The view doesn't zoom in/out appropriately, it just remains at (I'm guessing) 150% and 100% respectively.

Also, when I zoom to 50% or lower the diagram is incredibly small, so much so that the diagram is only a few pixels in height and width!

The job flow diagram I was experimenting with isn't complex and at 100% would only take one, maybe one and a half, pages to print.

Product Version: 3.0.7.1
Console Version: 3.0.0.1034
WinXP, sp3