Shift+Scroll Mixer adjustments OS X

I’m used to doing fine adjustments on fader, pan and knob settings by pressing the SHIFT key and scrolling. This worked fine until I reinstalled my mac and all my important programs and drivers. I can still use this type of fine adjustments with my macbook trackpad (SHIFT + two-finger scroll) but not with my logitech mouse. When pressing SHIFT and turning the scroll wheel over a fader in the mixer it scrolls the whole mixer horizontally… I’ve tried reinstalling logitech drivers, tried without them, tried to look for solutions on the web and looked for differents settings in both system Prefs and Cubase prefs… Is there something I’m missing?

Macbook pro, logitech VX nano, Snow Leopard, Cubase 5.5.2