Comment 5 for bug 398280

I also have frequent crashes with NetBeans. In several, at first glance random, moments. I just found a consistent way to reproduce a crash. This is what I explain next.

Steps to reproduce:
1. Open NetBeans
2. Right-click on a project in the project browser
3. Click "Properties", a windows titled "Project Properties" will appear
4. Resize that window during a couple a couple of seconds ()

What should happen: The "Project Properties" window gets resized.

What happens now: NetBeans crashes. If I start it from console (simply typing "netbeans"), on crashing some output appears: "
The program '<unknown>' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
  (Details: serial 18972 error_code 8 request_code 140 minor_code 4)
  (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.)
"

System
* Hardware
** CPU: Intel Core Duo T2400
** GPU: ATI Mobility Radeon X1400
* Software
** Ubuntu 9.10 Karmic Koala Desktop Edition i386
** NetBeans IDE 6.7.1-0ubuntu1 (netbeans)
** Tested with both OpenJDK and Sun Java Runtime Environments
** All packages updated until one hour ago

Let me know if I can provide more significant data.