Xorg problems

[raymond.meyer%rambler.ru@localhost]

Hi, I've just installed NetBSD-current on i386 from sources updated yesterday. 
I'm having problems with Xorg:

1. Typing 'startx' starts Xserver and twm, for some reason the mouse only 
moves horizontally, I can't move it vertically

2. Exiting Xserver leaves me with a blank screen, i.e. I can't see the 
console. I can type commands at the console and they get execute, but the 
screen it totally black.

Any ideas? The graphics card is ATI Rage 128 and the mouse parameters in 
xorg.conf are

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "wsmouse"
        Option      "Device" "/dev/wsmouse"
        Option      "ZAxisMapping" "4 5"
EndSection