Comment 1 for bug 1198806

Thanks for taking your time to report this issue and help making Ubuntu better.

You don't specify which Ubuntu release you are running, but n openscenegraph 3.0.1-4.1 on Ubuntu Saucy I get the following error message:
$ osgviewerQt
The program 'osgviewerQt' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadRequest (invalid request code or no such operation)'.
  (Details: serial 697 error_code 1 request_code 153 minor_code 51)
  (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.)

I realize this is not the same error message, but they both indicate an unknown/invalid X-request, so I find it likely they are related.