zoom gesture not working

That's strange. Seems that the zoom gesture in my browser doesn't work with this theme. It happens with safari and chrome in my Ipad, and also in Android with the default browser. I can see the problem also with the "demo" site. Can anybody confirm? Any workaround? Is it a bug or...a feature?
Thanks! :-)

Ps. I think that your "premium responsive" and "best responsive" theme have the same problem... maybe some javascript is disabling the feature?