pinch zoom not working
pinch zoom function on safari browser on text on pictures no longer working
MacBook Pro (15-inch Late 2011), OS X Mountain Lion (10.8.3)
Really old question... I have where the issue come and go. The pinch to zoom or shrink will work and then it stops working, either I need to reboot or just wait for it to come back.
But now, if it happens I switch to another account/user (I've setup a 2nd account that clean) through fast user switching and launch Safari. I go to any of the default sites and test, if pinch to zoom works, I continue to surf to a few sites using the pinch to zoom each time. After a little bit I log out and log back into my main account and it works again.
No restart required (I generally have 20-30 apps open so restarting is a pain).