Comment 4 for bug 479564

I couldn't always reproduce it consistently even by following the same steps. But one way was:
1. Open project
2. Open properties
3. Change speed to 2x
4. Click apply
5. Change speed to 1x
6. Click apply
7. Go to Length
8. Make no change, click Apply => crash

I get an error when I open OpenShot:
/usr/share/openshot/windows/SimpleGladeApp.py:340: GtkWarning: gtk_toolbar_set_icon_size: assertion `icon_size != GTK_ICON_SIZE_INVALID' failed
  return gtk.glade.XML(self.glade_path, root, domain)
A new frmMain has been created

Below are a few more (different) error messages at the time of crash:
GenerateXML for an Effect
on_btnClose_clicked
on_frmClipProperties_destroy
The program 'openshot' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadWindow (invalid Window parameter)'.
  (Details: serial 219 error_code 3 request_code 3 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.)
Segmentation fault

GenerateXML for an Effect
on_btnClose_clicked
on_frmClipProperties_destroy
The program 'openshot' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadDrawable (invalid Pixmap or Window parameter)'.
  (Details: serial 163 error_code 9 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.)
Segmentation fault