No shape and sync extensions in xorg?

[Dennis Jacobfeuerborn]

Hi,
When I try to enable the desktop effects (ie. compiz) I get the following 
output:

[dennis at nexus ~]$ desktop-effects
compiz: No sync extension
The program 'gnome-window-decorator' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
   (Details: serial 426 error_code 8 request_code 72 minor_code 0)
   (Note to programmers: normally, X errors are reported asynchronously;
    that is, you will receive the error a while after causing it.
    To debug your program, run it with the --sync command line
    option to change this behavior. You can then get a meaningful
    backtrace from your debugger if you break on the gdk_x_error() function.)
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".
[dennis at nexus ~]$ Xlib:  extension "SHAPE" missing on display ":0.0".
Xlib:  extension "SHAPE" missing on display ":0.0".

I checked the extensions directory, the xorg log and the xdpyinfo output 
but I can't find those extensions mentioned anywhere. The window corners in 
metacity aren't rounded either. Is this a known problem or should I file a bug?

Regards,
   Dennis