gdm, dbus or xscreensaver...?

[Jeff Molofee]

I've had a serious problem this past week. I did an update last week, 
and after rebooting, I noticed an odd bar of scrambled graphics at the 
top of the screen in gdm/gnome. When I moved the mouse the bar would 
change, my keyboard would lock, etc. I ended up removing everything, and 
reinstalling clean.

For the past 3 nights everything has been fine. Until I updated my ports 
today.

 From console I watched the system upgrade GDM, DBUS and XSCREENSAVER. I 
shutdown, restarted my machine, and as soon as the gdm login screen 
appears I see this scrambled bar of color at the top of the screen. It 
looks like the mouse is somehow causing data to write directly to the 
display. I can still see my mouse pointer, and everything seems to be 
fine (keyboard works), but this bar of about 20-50 pixels full of random 
colors wont go away. The minute I move the mouse those lines are filled 
with colors.

I tried disabling dbus. This didn't help. I removed, and reinstalled 
gdm, nothing. I removed and reinstalled xscreensaver, still nothing. I 
know those were the only threee ports upgraded. Does anyone know what's 
going on?

releng_6
intel cpu
sata drives
usb mouse/keyboard
gnome2
all ports up to date
kernel/world up to date
nvidia 5900fx

all worked fine a few hours ago :)

I can send a screenshot if anyone would like to see the problem.