Can't manually update anymore

[mesogreat]

I've been meaning to update my apple tv 2 and iPad to the latest jailbreaks. Come to find out i can't. Every time i go to hit shift + restore to open a restore file in iTunes it doesn't work any more. Did itunes disable this function in the latest itunes update. Im not sure what it could be. I am using a windows keyboard on a Mac but it worked all the other times i did it. i even tried to dfu my iPad and do a restore and had no luck. I went to my pc and it worked fine. The problem is i have to do the ipad on the mac because all my synced stuff is on that iTunes.

 

[Intell]

If the machine is running Mac OS X, press the Alt/Option key.