I'm on Windows - and for me, Ctrl + scroll wheel zooms the image (not Alt + scroll wheel). That's a common shortcut in many programs (don't know about MacOS though).
However, I personally find mouse clicking between (say) 1:1 and Fill, hitting the space bar as needed (also using that to pan) both quicker, and more useful.
I'm on a Mac:
OS X Maverics 10.9.4 (13E28)
Adobe Lightroom 4 version 4.4
The shortcuts for control, alt or option + the mouse wheel don't work to zoom in or out. It stop working suddenly. Thanks for your help.
It doesn't work for me either. Has this been working before? I am new to the Mac version. It used to work on Windows.
Yes, it used to work. I'm on the mac version as well. It's such a hindrance to my workflow not being able to zoom with the mouse wheel. Anyone know the cause?