Tested in Glade 3.6.0 (Jaunty) - the menu editor no longer allows a menuitem to be changed after it is created so this cannot be reproduced. Thanks for the bug report.
Tested in Glade 3.6.0 (Jaunty) - the menu editor no longer allows a menuitem to be changed after it is created so this cannot be reproduced. Thanks for the bug report.