any help ,any suggestion

[milus <milus177 poczta onet pl>]

2 weeks ago i sent a message:
I've  followed steps mentioned in installation guide but ...
i am able to  compile and run programs from
gtk2.0  tutorial and everything seems to be ok but it is not ..
Here when i try to run gtk-demo i see :
The program 'gtk-demo' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadLength (poly request too large or internal Xlib length
erro'.
  (Details: serial 40 error_code 16 request_code 154 minor_code 20)
  (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.)
What is wrong ???????

and i get no answer ,i can't belive that anyone can help me
	milus