Comment 9 for bug 71030

The fix provided by Bryce Harrington at https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/71030/comments/3 does not work on 8.04. I can killall gnome-screensaver but I still can't launch gnome-screensaver-preferences. I get the same:

The error was 'BadColor (invalid Colormap parameter)'.
  (Details: serial 254 error_code 12 request_code 1 minor_code 0)

I have the same symptoms as he, and an additional one: in nvidia-settings, when I click on OpenGL/GLX Information, nvidia-settings crashes with this error:

The error was 'BadMatch (invalid parameter attributes)'.
  (Details: serial 303 error_code 8 request_code 78 minor_code 0)

Locking assertion failure. Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0xb749b767]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x2e) [0xb749b81e]
#2 /usr/lib/libX11.so.6 [0xb78ca518]
#3 /usr/lib/libX11.so.6(XESetCloseDisplay+0x31) [0xb78ad8d1]
#4 /usr/lib/libGL.so.1 [0xb72754d5]
#5 /lib/tls/i686/cmov/libc.so.6(exit+0xd4) [0xb775c084]
#6 /usr/lib/libgdk-x11-2.0.so.0 [0xb7bb4637]
#7 /usr/lib/libX11.so.6(_XError+0xfe) [0xb78c373e]
#8 /usr/lib/libX11.so.6 [0xb78cae5c]
#9 /usr/lib/libX11.so.6(_XReply+0x15a) [0xb78cb21a]
#10 /usr/lib/libX11.so.6(XQueryExtension+0xaa) [0xb78b906a]
#11 /usr/lib/libX11.so.6(XInitExtension+0x3b) [0xb78add4b]
#12 /usr/lib/libXext.so.6(XextAddDisplay+0x53) [0xb7889443]
#13 /usr/lib/libGL.so.1 [0xb7295474]

I have 3 nvidia cards, 3 monitors.