In preferences, do you have "enlarge window contents to improve readability" selected?
That option appears to disable the zoom in/zoom out from the script.
Zoom In works just fine even though I have "enlarge window contents to improve readability" selected. In FM10 both Zoom IN and Zoom Out work. Zoom Out doesn't work in FM11.
I have windows XP installed on my computer with FileMaker 11.03 advanced.
When I run a script to zoom out, the displayed data gets smaller.
If I run a script to zoom in, the displayed data gets larger.
If I select "Enlarge window contents, zoom in continues to work, but zoom out fails to work anymore.
Try the same file in FM10
I'm not saying it isn't a bug. I'm just trying to nail down all the details.