The program 'presenter' received an X Window System error. This probably reflects a bug in the program. The error was 'BadShmSeg (invalid shared segment parameter)'. (Details: serial 351 error_code 158 request_code 132 minor_code 19) (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.)
It's really annoying to have an application which does what it's meant to, but crashes all the time.