For me mouse1, 2, 3, 4 and 5 work fine, but it will not let me set the other buttons in the controls menu, it doesn't respond to those buttons for some reason.
In the software for my mouse (Razer Diamondback 3G), I can set it to a key instead of mouse button, but it does nothing. I can tell it to be a macro, which works, but lags. Maybe I should play around with it more.
I have g5 logitech and it works fine.
Just like was said by sittingduck, set the valeus to the keys u want to use in the mouse software.
I use only numbers so fpr example pushing mousewheel to left is 1, push right is 2 sensitivy up is 3 sens down is 4 etc.
I use the original mouse-software.
No problems here with setting keys
Hope u fox your problem soon