I've a weird issue. On my macbook 2010, when I use Google Chrome, Command+Left Shift+T doesn't work as expected. I would expect it to reopen last closed tab, but, instead, it simply opens a new one. For what it's worth, same combo, but using right shift key works as expected - reopens last closed tab. Note that, aside from that, left shift key is working just fine. I tried a few extensions for Google Chrome that would let me change the keyboard shortcut, but none of them are using key-press recognition, and in none of them is right-shift, or it's variation that seem logical, are recognized. I'm on Yosemite 10.10.