Thank you TIG! It was as simple as that. A tool bar moved and it resized the SU viewing area. Not realizing this, I kept doing to myself! I appreciate the help!

I may be doing something unknowingly. I am defining a scene tab and then using it for an extended period of time switching back and forth to diffent tabs. Then at some point I will go back to the saved tab and the saved setting has changed slightly. It zooms in or out just very slightly.

I am using a mouse.

I am using SU 7. When I save a scene for some reason it will shift in or out from time to time. This is frustrating because I rely on the scene being consistent for overlaying images I export.

What causes this?